Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d225f19e0e1297…

MALICIOUS

PDF

50.4 KB Created: 2020-08-25 11:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9708dd601863373f72871e87d2a4155a SHA-1: 95757b1b8e7a053faf208c3f3e48afc2c280ae1d SHA-256: 39d225f19e0e1297610b3be65a72bdceaed85f0199ea3327ba0a82ee78b05f58
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One such link, 'https://ttraff.ru/pify?keyword=ccna+7+chapter+2+answers', is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to lure the user to this malicious redirector. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=ccna+7+chapter+2+answers
    • http://files.bajaartcollective.com/uploads/1/3/1/0/131070178/4899933.pdf
    • http://files.obclansing.org/uploads/1/3/0/7/130738876/zogikudiwiju.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/nuwisu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/jpg_to_word_converter_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/4666/5382/files/kaspersky_free_antivirus_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0430/6357/4682/files/final_countdown_meme.pdf
    • https://cdn.shopify.com/s/files/1/0435/5257/1555/files/kagorajezababavegifel.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/welugawofalabewuwi.pdf
    • https://cdn.shopify.com/s/files/1/0450/5973/5704/files/description_of_a_person_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0432/5697/1432/files/reludutanovoxi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5269/3654/files/80881981651.pdf
    • https://cdn.shopify.com/s/files/1/0438/5685/5190/files/language_basic_concepts_theories_and_pedagogy_english_in_use.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/fit_of_bad_temper_informal_5_letters.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0433/8830/5575/files/platform_for_vande_bharat_express.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_off00008111.bin
ef51cf423e9e6c94a0a6f571b5cc6a666d1da74ce5e0c83bb8d7a9ad756b6f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8111 5200 bytes
font_01_sfnt_off000092c5.bin
2fff69a26e60e4920daf8ee7e3e76b4e27cd4c8708701abcbfa312f373086a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92C5 13152 bytes

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