Malicious PDF — malware analysis report

Static analysis result for SHA-256 b685268b0b9beb1d…

MALICIOUS

PDF

87.1 KB Created: 2020-10-29 22:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e3b0b1ad23ad524d51be345de9626cc0 SHA-1: ecb566b3edc1e794f9a497d1ba36ac5a945272de SHA-256: b685268b0b9beb1dc14e82a72d82d0cc1b1ee42dabcaa472c4c9d4261012527a
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lead users to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for game-related content. The ML classifier strongly indicates maliciousness, and the presence of a link farm further supports a malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/strik?keyword=how+to+disable+discord+overlay+ffxiv In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3210/5119/files/jotirofo.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/1st_year_biology_text_book_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3732/5462/files/kill_all_entities_minecraft_1.7.10.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/wogekuzajogigutezabuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35209136-35f9-415f-a0ae-01eb48ebced5/mibuxumajutapuvejimizak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baebefe7-5d2d-489f-a540-d61de3c6b536/61249463799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc04847-c1cd-4f78-aa4b-8ecef3ab51dc/symbicort_budesonide_formoterol_obat_apa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/7171/9574/files/downlod_sim_city_mod_apk_android-1.com.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4417/0647/files/takivomawubutadoxoponoso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8707/8592/files/70060168631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f69277f-3302-4cc5-9d4c-b06fb1c6bf32/pumuxolowova.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/act_reading_practice_test_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865cc350-47ee-4f2d-9d14-19e01c923ec5/10712583574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d5150b-ac15-4f34-b39d-41c373bc4591/tetinonazejabolubuwamogo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000127f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x127F0 22876 bytes
SHA-256: d47ad370ffd92fa9af7f8696e32a929c17a87eb64c903077d2fbb4f8b6c3db2a
font_00_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 5440 bytes
SHA-256: 498a0094825c5e37c2d62923a45153ef7c449dad7d20bc6acce066cd386e851c
font_01_sfnt_off0001045a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 10440 bytes
SHA-256: 4069c64f1364607a66f99aa65ba8de419ce0193b9a75af5a302a7265f048e4b4

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