Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff7a7cdad9761ae…

MALICIOUS

PDF

43.7 KB Created: 2020-08-02 19:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8270077edd7bc8d941f5952eaa42f31 SHA-1: 7675bf4dab8a3503d1bb2662da0484328463a061 SHA-256: 4ff7a7cdad9761ae38b048247a82c2a10781dd0c4a480e33084de6340ceb27e0
152 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.com/pify?keyword=kenshi+slavery+mod'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs hosted on various domains, including several on Shopify. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and several other PDF links, reinforcing the redirection and link farm attack patterns.

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=kenshi+slavery+mod
    • http://files.bennettmachineindustrial.com/uploads/1/3/0/8/130874477/8003404.pdf
    • http://files.bankfarmlleyn.co.uk/uploads/1/3/1/1/131164153/begogimiziforu-xuzim-duvuxoz.pdf
    • http://files.theinvestorsguideforbeginners.com/uploads/1/3/0/7/130775653/1511d802136.pdf
    • http://files.westhay.com/uploads/1/3/1/4/131453894/7324285.pdf
    • http://files.proofreading-course.com/uploads/1/3/1/3/131379253/vifijabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3652/files/24776520293.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/lipefopazipuxikaxezugeson.pdf
    • https://cdn.shopify.com/s/files/1/0430/8077/7882/files/kivugab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13534048661.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/38215565410.pdf
    • https://cdn.shopify.com/s/files/1/0433/8614/2876/files/84722141603.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/nizuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/66315275452.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/48400205619.pdf
    • https://cdn.shopify.com/s/files/1/0430/0429/7375/files/54306618357.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/teduresitexonopa.pdf
    • https://cdn.shopify.com/s/files/1/0444/4097/7574/files/principles_of_macroeconomics_7th_edition_free.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_off00006e70.bin
4fc39944ccbd4d17f335a83e102a935b791b85e0d6ca9a1ff406c641fa986cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E70 5196 bytes
font_01_sfnt_off00008000.bin
8ad86043e615c17e8a44d60a3c1afe6b1b88b6b588d5796e7763b4bf1cb301d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8000 10056 bytes

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