Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1259a71abe7ca6e…

MALICIOUS

PDF

35.8 KB Created: 2020-10-08 08:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a87edbd3de19e4e189f44d77af5eb07f SHA-1: 62cd6cdad3bc372e9b0ad3dd0fbe2ec69df3d005 SHA-256: f1259a71abe7ca6e3568c2e7618cc9c46041684b822bb0140b519e222cf096e1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it functions as a link farm, likely to distribute malware or lead users to phishing sites. The document body itself contains garbled text and a reference to the malicious URL, suggesting an attempt to obscure the true nature of the content.

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://cctraff.ru/strik?keyword=manual+despiece+traxxas+revo+3.3 In PDF document text
    • http://files.helturbines.org/uploads/1/3/1/3/131381607/tazoj-vogufozu-xikazofowusuxug-joxuze.pdfIn PDF document text
    • http://bajux.creatingforachange.com/uploads/1/3/2/7/132712593/e3b416112484.pdfIn PDF document text
    • http://bamigowol.susanmckayartist.com/uploads/1/3/0/8/130873791/aed638a8a1707.pdfIn PDF document text
    • http://tileweb.chicagocoatings.org/uploads/1/3/1/4/131453151/9550d87407e22.pdfIn PDF document text
    • http://files.keylinevermont.com/uploads/1/3/1/3/131381363/komaput.pdfIn PDF document text
    • http://files.servinggodgracefully.net/uploads/1/3/1/8/131871655/zalebijerij_murux_danasijim_xexipisoke.pdfIn PDF document text
    • http://fojodili.kottagekennels.com/uploads/1/3/2/7/132741555/fosipuneju_logawuxenenopug_wurosarizemida_gaminovugej.pdfIn PDF document text
    • https://site-1037245.mozfiles.com/files/1037245/61142066386.pdfIn PDF document text
    • https://site-1040002.mozfiles.com/files/1040002/17648485595.pdfIn PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/dusesog.pdfIn PDF document text
    • https://site-1038358.mozfiles.com/files/1038358/62481599990.pdfIn 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/1/0485/1246/7106/files/84531059992.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/vocabulary_workshop_level_g_unit_10_vocabulary_in_context_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/63897732553.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/5851/8184/files/1801821148.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_off00004d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D07 5396 bytes
SHA-256: 6835a22125ad982595c26544e39398b8e38314c36e107f0dfc69aedfcef890d7
font_01_sfnt_off00005f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F86 10280 bytes
SHA-256: 8f33e80703ec2ffc22635ae5d1a24846a93fc31e85239108d18823e83764d39b

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