Malicious PDF — malware analysis report

Static analysis result for SHA-256 306733010e0c38b4…

MALICIOUS

PDF

76.8 KB Created: 2020-11-01 20:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f97279011c180a9ae9442d54c95d2242 SHA-1: 4c16b29a274b38d086ed20b08e8084e3cabcd8d3 SHA-256: 306733010e0c38b49cb085e545280d26dfd3f4609a5f142d9e056bf17bd1f140
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a malicious redirector and a link farm, with one critical link pointing to ttraff.ru. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to a malicious site. The ML classifier strongly flags this PDF as malicious, and the 'Fake invoice / payment lure' heuristic further supports the attack pattern.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=e601i-a3+tv+stand In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_5f9ad21214ed9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_5f9c872580bef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_5f9a8c4873499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5f96f182bc69d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_5f9ee755431d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f96b6b5e1499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_5f9a1bdfcfd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f8702ee1ec94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409113/normal_5f9e2804e3897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f87385b512c1.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/90da0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382618/normal_5f91dbeff3bf3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/729b008d-23aa-4a85-b648-88199afef63d/23189109664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0cb788-3b3a-42a7-94bb-b91f9c9762d7/spore_apk_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3657e4db-16a5-430b-924e-1ec69f52a631/brady_bunch_theme_song_without_lyrics_free_download.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 5252 bytes
SHA-256: bbe40e9fbaab0fa32b8a0bd5875b9f8e34231900e98ff73a30d93144ecb5fda2
font_01_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 10680 bytes
SHA-256: fe67655e1dbbbc175c45f6f53b23650a518396d4bf752c21d30dd094bfedf9db

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