Malicious PDF — malware analysis report

Static analysis result for SHA-256 af818f4c9d5bb46a…

MALICIOUS

PDF

80.8 KB Created: 2020-10-29 09:00:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f93e0586fa6e90779d7d726554c75dab SHA-1: 376449f8271064418f8677fef5f51273201bc778 SHA-256: af818f4c9d5bb46a0e68db049fed8524a6e9534a994f45f4e8de4fa9a57063f0
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting link farms. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure and embedded links suggest an attempt to lure users to malicious websites, potentially for phishing or malware distribution.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ttraff.ru/pify?keyword=d%2526d+5e+mass+combat In PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/xotudijozalikeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_5f967bef40286.pdfIn PDF document text
    • https://dijumigomeruke.weebly.com/uploads/1/3/4/3/134309809/xobefixuxil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_5f8ab273983f1.pdfIn PDF document text
    • https://tewubituzidebu.weebly.com/uploads/1/3/4/3/134359488/xinogujomigujo-zuzifuvaminuko-pudigiji.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/ccff0c5d0.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/7784155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f8a11b809b5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f875b2a4b908.pdfIn PDF document text
    • https://sunuzokelegawo.weebly.com/uploads/1/3/4/4/134476032/fuvomenofatafuse.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/917616.pdfIn PDF document text
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/vikiroxudaba_labexapawiwaxi_sagepetit_vavadu.pdfIn 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
    • https://s3.amazonaws.com/nitajosasa/823749467.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/risk_for_hemorrhage_postpartum_nursing_diagnosis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4037/3398/files/13424155877.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/69566328171.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/1776_to_1976_half_dollar_value_ebay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2735/1717/files/auto_indent_android_studio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0894/8386/files/dyson_ball_multi_floor_canister_cleaning.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/basic_language_skills.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000f50e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF50E 28760 bytes
SHA-256: ef3a1ac1e508de7d449595f0b407d459ea65aa17b35888194732e22338138af8
font_00_sfnt_off0000b492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB492 3012 bytes
SHA-256: a399fe96af801c2052f662cdbde4f42b4a683414ee7bc8e1620d29cb9b520efd
font_01_sfnt_off0000bf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF59 3484 bytes
SHA-256: 33019dbc7dce146be9396d22118e5eda0a3a9187904cdfdddb9ce8b8b2194f61
font_02_sfnt_off0000cac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 13212 bytes
SHA-256: b6712538d0c2cba4ca27770a6a2a4bcab329e40c5e2b570abd49f17b1179f7ab
font_04_sfnt_off000126cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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