Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d140aa735aca553…

MALICIOUS

PDF

54.2 KB Created: 2020-08-11 10:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae31a7b7bf8ec1db3e8db80c75764a46 SHA-1: 01f9f4dc10074568948f33f245fd7a838bb432ad SHA-256: 5d140aa735aca55314f726c1951e9afd0aa10a621bb86f59e251b658f4eb1de5
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/pify. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many pointing to Shopify domains, indicates a potential link farm or SEO manipulation tactic to disguise the malicious intent. The ML classifier strongly supports the malicious nature of this PDF.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=chuy%25E1%25BB%2583n+t%25E1%25BB%25AB+pdf+%25E1%25BA%25A3nh+sang+word
    • http://files.txroyaltyphotography.com/uploads/1/3/0/9/130969118/fuxoxawok.pdf
    • http://files.c3huu.org/uploads/1/3/2/7/132710763/6079734.pdf
    • http://files.themagicstudio.ca/uploads/1/3/0/7/130739919/8559639.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/6488/5402/files/19277717008.pdf
    • https://cdn.shopify.com/s/files/1/0432/7751/6955/files/metal_additive_manufacturing_a_review_of_mechanical_properties.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/agradecimientos_de_tesis_de_licenciatura.pdf
    • https://cdn.shopify.com/s/files/1/0455/7688/0293/files/book_for_learning_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0435/0027/3830/files/xinosevovewumipijufa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/62285381680.pdf
    • https://cdn.shopify.com/s/files/1/0431/1865/7697/files/vuroli.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/81668389642.pdf
    • https://cdn.shopify.com/s/files/1/0437/1457/6537/files/wijinamimi.pdf
    • https://cdn.shopify.com/s/files/1/0452/7095/8241/files/noun_clauses_rewrite_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/30429979763.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008360.bin
2be993912884e8b621c451c17be23f8bfd0aae7a79fb3465c635a5dd7681ddaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8360 5836 bytes
font_01_sfnt_off000096ad.bin
2b58c994c1a0975de1190ef88cbf7ffd75a9cd469a78ed9d72e0554a4b1e4af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96AD 11592 bytes
font_02_sfnt_off0000bbfd.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFD 4324 bytes

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