Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cafc3555293b87…

MALICIOUS

PDF

52.3 KB Created: 2020-07-31 15:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfb3ea1e229e6f4736099f8b5f63e310 SHA-1: 3936e8d7d990809ea06b972ce753ac69d9fe3bbb SHA-256: 05cafc3555293b87956069e479a0da7901394f08d416ec6d79453bb94442684a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic indicates a link to known malicious redirector infrastructure (ttraff.com), which is likely used to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/pify?keyword=ase+a5+study+guide+pdf
    • http://files.thefashionanalyst.com/uploads/1/3/1/3/131383624/wezunawe.pdf
    • http://files.glapousis.com/uploads/1/3/2/6/132695200/gamokapaverumapis.pdf
    • http://files.costavistachiro.com/uploads/1/3/2/6/132681985/lowamupaf.pdf
    • http://files.individualee.com/uploads/1/3/0/7/130776246/linejofamifatowizu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/nojorev.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/lufaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4676/files/sofiranitatavujakoza.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/35263629630.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9590150980.pdf
    • https://cdn.shopify.com/s/files/1/0432/0460/8155/files/tuduvet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4155504299.pdf
    • https://cdn.shopify.com/s/files/1/0433/1021/9422/files/nosedujetaxadekivipotozi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9541/7237/files/fuxesezujuloniki.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/torokerojinebitoruselinu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/jisiredut.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4554/files/64132548054.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/wobawowokisewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9293/files/zabafodijekidebinavujubis.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_off00009097.bin
e3ea1992cc3a4e15c786e2cf627ca82481b055dace2a129ea86367b3873fc911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9097 4960 bytes
font_01_sfnt_off0000a193.bin
ab59c62641e6e975da892612c4528cd7cd82a6d108f3daea055a34b84d371ebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA193 10156 bytes

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