Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd2eafcc09e8449…

MALICIOUS

PDF

47.7 KB Created: 2020-11-03 00:26:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4dc7b2cec2c5c31f531c0a7a0f65c636 SHA-1: ba9131fda0a395bd366b76f2c9415218650e47c2 SHA-256: 6cd2eafcc09e844910ace5515baa04105a99a8f3f5d025c439f9e39144f10520
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to external PDF files hosted on various disposable domains, indicating a link farm or SEO manipulation scheme. One of the embedded URLs, 'https://ttraff.ru/123?keyword=types+of+instructions', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself contains obfuscated text and references to the 'wkhtmltopdf' tool, suggesting it was programmatically generated.

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.
  • 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/123?keyword=types+of+instructions In PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/5ed105f152d8.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/jizuginotu-timuwufixawojer-fajumuxozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_5f9868685b84d.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/1beae7928cd13.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/dilufoxilesuta_gobasefitudufod_wagevujoti_buvaferifevudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402948/normal_5f92410263a3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5f8fd54c3ed28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_5f9d73451b2bf.pdfIn PDF document text
    • https://weroxodadugofu.weebly.com/uploads/1/3/4/5/134503620/9056449.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f97d5ca03298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f888143264a2.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/3532406.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/wilugugo/bsc_nursing_syllabus_mpmsu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFE 4700 bytes
SHA-256: 4698eb41741edb76cfebac2e8cee298dd33e9268d3f897d045a658d2bf9be561
font_01_sfnt_off00007e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E15 11212 bytes
SHA-256: 4efe718b20e9f03c708fdce99ae98d29d47536256312c3ce74f4b617f78c7823
font_02_sfnt_off0000a46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA46C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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