Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b17bdbed6c59bfc…

MALICIOUS

PDF

85.2 KB Created: 2020-08-22 22:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6a66f3d93018b5bd5e8cf8485a235a8 SHA-1: 5dc60cb375630efa3c2290c50f31d1d613111906 SHA-256: 5b17bdbed6c59bfc6e1d4118632ec41f5d70711fe6489de7762ac81e52fb2fac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ttraff.ru/pify?keyword=valpakine+bula+pdf'. Additionally, the PDF exhibits characteristics of a link farm, containing numerous external PDF links, many of which are hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. These indicators suggest the primary purpose is to redirect users to malicious content.

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.ru/pify?keyword=valpakine+bula+pdf
    • http://files.6foot7dave.com/uploads/1/3/0/9/130969731/fezisaluz.pdf
    • http://pozeg.batonrougedumpsterrentalpros.com/uploads/1/3/0/7/130775403/doxiw.pdf
    • http://files.vmimpressions.com/uploads/1/3/1/4/131407369/2879e4.pdf
    • http://files.zendope.com/uploads/1/3/2/6/132682471/miset.pdf
    • http://jilub.hollywoodrobbie.com/uploads/1/3/2/7/132740405/8b16f7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/62670524744.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/9916382603.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/metabolic_syndrome_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9576/files/master_plan_of_evangelism_robert_coleman.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/best_sword_fighting_games.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/pdf_broiler_farming_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0430/6917/8017/files/gozal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41841620016.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/2002_chevy_malibu_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/20103198839.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83260340608.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/katogivavugajipifolu.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_off00011221.bin
87d29d5fd1d1de07acaea29efc96d350f5a480a63f3b5b5807df8a4130ea5117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 4928 bytes
font_01_sfnt_off000122f2.bin
5cdaded2a1c460880e348f98ba9c0f7b5ed7b2a639e027c3f9b421ddcb8f5e28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 10928 bytes

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