Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b43d0b975995ef8…

MALICIOUS

PDF

36.8 KB Created: 2020-08-30 12:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afc4b518aec7a9f78948071800f1b12d SHA-1: cc12fe0a5ce2b5c44ba2767a577406558e57139d SHA-256: 1b43d0b975995ef8ec4f0e8d6325d70f8c380972f7dc67a7e437e4f4f5809314
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=pro+pectalin+pastillas+para+perros'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'https://cdn.shopify.com/s/files/1/0431/3510/7233/files/89350061774.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the primary malicious URL and several other Shopify URLs, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=pro+pectalin+pastillas+para+perros
    • https://cdn.shopify.com/s/files/1/0431/3510/7233/files/89350061774.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8535/files/94293538557.pdf
    • https://cdn.shopify.com/s/files/1/0435/8694/5187/files/breakfast_around_the_world.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebedaxogatasimilore.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6457/files/walmart_graduation_assessment_test_answers_2019.pdf
    • https://static.usrfiles.com/ugd/1d64af_b315597c1f7d479fa0fb13c6b276e9e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_dce3492ddc904da6843f81230637b7e9.pdf
    • https://cdn.shopify.com/s/files/1/0468/0338/6517/files/355657490.pdf
    • https://cdn.shopify.com/s/files/1/0465/4176/6814/files/wallpaper_couple_anime_hd.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3069/files/37965008823.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8524/files/28794776856.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/86180791525.pdf
    • https://cdn.shopify.com/s/files/1/0434/1497/8718/files/gebuzevelamesupufamel.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fe1.bin
fa32248194763001ac596f2403049d64dd1d4c94a0d800fc441cbe554e8332da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE1 4928 bytes
font_01_sfnt_off000060ab.bin
6d9491702fdb0c19fa2d2e3f2775eb0be40906d8621b4211df9238b2ccc01267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AB 11104 bytes

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