Malicious PDF — malware analysis report

Static analysis result for SHA-256 797d5d6a0a0bde56…

MALICIOUS

PDF

41.8 KB Created: 2020-08-11 04:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ae30bf4ac365a9d8f767b8c732fd49d SHA-1: 709182e1d932aaef7984afa8c8d020e954c00cc3 SHA-256: 797d5d6a0a0bde565dd29514275096392ae5cbb0ce9da648ea904ded5e3bc777
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 'ttraff.ru'. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many of which are to Shopify-hosted PDFs. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=parent+functions+graphs+pdf', suggesting a lure to a malicious site disguised as educational 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=parent+functions+graphs+pdf
    • http://files.gianthuntersfishingholidays.com/uploads/1/3/0/9/130969573/kebavedefu.pdf
    • http://files.marcodim.com/uploads/1/3/0/7/130740112/ffda9e686c23b.pdf
    • http://files.deepriveras.com/uploads/1/3/1/0/131070351/3d73fd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35031547028.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/31485191005.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/wekudemokuvibozonevefipol.pdf
    • https://cdn.shopify.com/s/files/1/0432/2902/0317/files/88016325336.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/1532532907.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7516/files/vavinajonefuza.pdf
    • https://cdn.shopify.com/s/files/1/0437/4226/5498/files/6th_grade_math_assessment.pdf
    • https://cdn.shopify.com/s/files/1/0434/9971/6770/files/86682993001.pdf
    • https://cdn.shopify.com/s/files/1/0441/1647/6056/files/kipalebapoponuta.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rexalomofovuwazeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/33517818643.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/96171570924.pdf
    • https://cdn.shopify.com/s/files/1/0437/2827/3569/files/3603202450.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_off00006616.bin
921f5f6ea40eab04123987ccb59ddfe02378b0e387d990e2b7a7b4da38edaae3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6616 5384 bytes
font_01_sfnt_off0000785c.bin
ef10ab2a0134c9ebca11cc7e5717c8186d9c3a264b73a783494488e3d79ca99f
pdf-font-stream PDF embedded font (sfnt) at offset 0x785C 10052 bytes