Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd285e0ad0e39da…

MALICIOUS

PDF

37.8 KB Created: 2020-08-22 15:39:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7ec7c1fbc2c55b747a09f5cb573a483 SHA-1: da3096cc15b5e479f7d158b3234b277fbd4f2c94 SHA-256: 5bd285e0ad0e39da76cbfc7332f05282543f25741c1f1c15f1acf2d05f0fa2fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link to 'ttraff.ru' which is flagged as malicious. It also hosts a large number of links to other PDFs, likely as part of a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest an attempt to lure the user 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=homograph+homonym+homophone+worksheet
    • http://files.sensebysense.com/uploads/1/3/2/6/132681544/57c153c2.pdf
    • http://files.bamyield.org/uploads/1/3/1/8/131856050/0a5d91.pdf
    • http://dukipowen.peacejams.com/uploads/1/3/0/8/130814328/dalufulivase-dilezil-ximomitonule-kesufifafokewuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3486/1987/files/12986697192.pdf
    • https://cdn.shopify.com/s/files/1/0435/1524/8794/files/96237785640.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://cdn.shopify.com/s/files/1/0464/7177/4366/files/pelezevu.pdf
    • https://cdn.shopify.com/s/files/1/0448/3937/0909/files/difijepenuziz.pdf
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/nideb.pdf
    • https://cdn.shopify.com/s/files/1/0430/3978/5111/files/2ez_table_2016.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8626/files/sufosikiguweminoxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/37438784103.pdf
    • https://cdn.shopify.com/s/files/1/0432/7754/9728/files/relesama.pdf
    • https://cdn.shopify.com/s/files/1/0439/1292/1256/files/wepodewaxuwunizu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/tavezomek.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_off000055c6.bin
cf357e353f7588d535f012d75cbf0b50112f84b6cd3be61c060e9e5dbff6371a
pdf-font-stream PDF embedded font (sfnt) at offset 0x55C6 5420 bytes
font_01_sfnt_off00006827.bin
9434abab41ebdae83cb2a12079fc45a3eba694e15c0529a397715cb5cdcd54ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x6827 9992 bytes