Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ae664ef7bd96c0…

MALICIOUS

PDF

62.3 KB Created: 2020-10-28 15:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 059b531b7edf85681be38c57b5af6a5d SHA-1: fa1423b6e6e70fb158b77f78ab551c930f5398db SHA-256: 37ae664ef7bd96c0a0dcdf2d3b4a2b2abf4bba10223400d4cfb43db7f139a70e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a lure related to "banking exam books free download pdf" and embeds a large number of links to external PDF files, a technique often used for SEO poisoning or distributing malware. One of the embedded URLs, https://cctraff.ru/wb?keyword=banking%20exam%20books%20free%20download%20pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/wb?keyword=banking%20exam%20books%20free%20download%20pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fb49dc-253c-4d31-a3fd-ab624309c3c9/28746067936.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9171/3447/files/15493122560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a5909d-b6b2-4863-9fb7-d251e2db3e2a/72687757499.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9357/6862/files/18691185194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/7904/1692/files/programming_challenges_python.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/research_proposal_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/zokotawazakipudesosixug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9bb3d7-d2d2-4f40-ac72-6a24ab61b82a/skyrim_civil_war_warband.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4159/0948/files/15735515749.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0915/8563/files/trippie_redd_a_love_letter_to_you_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4537/0521/files/50723806334.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7013/5719/files/ashley_furniture_tucson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9345f25-1eff-45dd-84e8-7be8df6f8d6a/libugoxobarudite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5fc983-fa8b-48f0-9120-3256ae6697dc/doleras.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/current_affairs_of_august_2019_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/ledomikavajarasid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6748/8411/files/fufezodekupugonoluvedume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9331/0631/files/xepiruzebulegex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4365/9677/files/likes_for_instagram_apk_para_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8540f51a-61fb-4c12-b90f-f81f26eef3b4/todd_mcfarlane_art_style.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8022/0317/files/5891145105.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8091/8203/files/xipoxedemovosunex.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7410 5484 bytes
SHA-256: a6953229030d141edfe97fd556da1556107d83320f3aa28838d74c28f4126346
font_01_sfnt_off0000869b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869B 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_02_sfnt_off0000903c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x903C 10596 bytes
SHA-256: 8f7de30a4768fec7d7b5d441b6a9b359f311f5f40c7f2039931540740e9fc444
font_03_sfnt_off0000b470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB470 16060 bytes
SHA-256: 8f676b3be356e2086f34f7c81dd3575184be90372cbe0b4aaba7ba30be3377d2
font_04_sfnt_off0000c90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_05_sfnt_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 5272 bytes
SHA-256: 95d434d6d6bad86f2d4aea58e66684d85f8cd16c5b028e3234a65d148115f39c

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