Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcfba018ebcc00c…

MALICIOUS

PDF

49.6 KB Created: 2020-11-08 02:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bf4d90092372e84d9c1a0a94881b560b SHA-1: 49e8164e3578b859bdae05103a67702d2815bda6 SHA-256: cfcfba018ebcc00c641a20d9f902843cfa7161bb6fafaba85520028df22048b4
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting and likely forming a link farm for SEO manipulation. The primary malicious URL, 'https://trafffe.ru/123?keyword=roblox+fe+gui', is embedded within the document body, suggesting a lure to a potentially malicious site. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of SEO spam tactics designed to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?keyword=roblox+fe+gui PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415546/normal_5f9592a676315.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/fagatuzemosifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f8a7d0faacb9.pdfIn PDF document text
    • https://xatomurukazaj.weebly.com/uploads/1/3/4/3/134378662/sevojuwukox-bulodereke-befuxujalonel-verivoka.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://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdfIn PDF document text
    • https://fanexose.files.wordpress.com/2020/11/download_fnaf_ultimate.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/upload_docx_to_google_docs.pdfIn PDF document text
    • https://fomajegesi.files.wordpress.com/2020/11/circe_font_free.pdfIn PDF document text
    • https://xivikutedito.files.wordpress.com/2020/11/telugu_bible_file_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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59BE 4364 bytes
SHA-256: 9ac9e955db29e5edb2e463c381af457b2594c3486304e8a5e1dea2d52a0a2d39
font_01_sfnt_off000068a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68A8 1796 bytes
SHA-256: dfab3945eace5ba27be1ad95d63d5142397767eab6bca27773794b33bda2302c
font_02_sfnt_off00007132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7132 10656 bytes
SHA-256: 8fd8f5a6481fe817842fe38ac8c8376d5e5bb2de778348672173989ca511cee3
font_03_sfnt_off000095ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95ED 16336 bytes
SHA-256: cb8b0c3b75634a3ac40028f3142d2b99dbff9c8bfe93654f62892c2eba89f065
font_04_sfnt_off0000ab72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB72 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2