Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c1e04c528537bf…

MALICIOUS

PDF

40.8 KB Created: 2020-09-09 20:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72c5e64b3a7a7d88b5c2f810d68dd654 SHA-1: e051d2a0e7b927145924333e8f8177b618ee89c7 SHA-256: 84c1e04c528537bfbb0673779df50944b61e72b1a3b9f726def589d59d6699a8
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDF files, a common tactic for SEO spam or link farms. One critical heuristic identified a link to a known malicious redirector infrastructure at https://ttraff.club/wix. The document body, though heavily obfuscated, contains the text "Tongue twister tagalog pdf" and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicates maliciousness.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.club/wix?keyword=tongue+twister+tagalog+pdf
    • http://files.clareannmatz.com/uploads/1/3/1/6/131606127/350687.pdf
    • http://files.mariecharpentier.net/uploads/1/3/1/4/131483019/batipaxadas.pdf
    • http://rutewirat.driussibuiltbathroomrenovations.com.au/uploads/1/3/0/8/130813846/f0c591fac4c.pdf
    • http://rovef.nantymoelprimary.com/uploads/1/3/0/7/130775200/65c1f3eab13.pdf
    • http://files.shiragirlschoir.org/uploads/1/3/2/6/132681438/b19819daffed.pdf
    • http://files.hilliardbradleyfootball.com/uploads/1/3/1/0/131070374/2969571.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0812/2270/files/dulifeb.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/xanabunodemesonudajalo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4540/files/topotujokakapenuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/3765227115.pdf
    • https://cdn.shopify.com/s/files/1/0432/3944/0543/files/goodbye_yellow_brick_road_choir_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5988/files/vazesipulojegewu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/tesijijibagoba.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9384/files/71208883480.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5907/files/answer_math_problems_with_steps.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/dnd_5e_paladin_build.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060eb.bin
38bb6a4ba6b6775c2089d943c2a673516fad3a33ab4b64d854cd22fc1d00f685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EB 5248 bytes
font_01_sfnt_off000072ea.bin
97fdff8cd514cd1b2b963a1b53deb6d91ad43b5c4efd3f38b7c3c4001298273f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EA 10436 bytes

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