Malicious PDF — malware analysis report

Static analysis result for SHA-256 723c9165a9546af9…

MALICIOUS

PDF

48.1 KB Created: 2020-08-30 19:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 910977745915644519d53f4ce7878182 SHA-1: 91f45d4065ee5b238458953bac790a5ffbd3cf56 SHA-256: 723c9165a9546af92a8e0db830b90b3ceb5f23b1b60caf5142b89d65ccb805d2
154 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, including one pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=going+to+california+sheet+music'. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to obscure the malicious destination. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=going+to+california+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8667/6117/files/kaforerokijitonizakixita.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/small_scale_pig_production.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/69279117657.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/68872568881.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1731/files/32983564705.pdf
    • https://cdn.shopify.com/s/files/1/0462/7372/4576/files/wow_classic_horde_druid_leveling_guide.pdf
    • https://static.usrfiles.com/ugd/d3758e_05f72654dca74f9a9b5eaac68d3c8f8c.pdf
    • https://static.usrfiles.com/ugd/7f929b_2c8c253cce6646ac9d3a3d797f4e7471.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/43209397892.pdf
    • https://cdn.shopify.com/s/files/1/0430/6658/9335/files/walt_disney_world_maps_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0446/2955/7411/files/celtic_alleluia_sending_forth.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_off00007e3f.bin
f968de371fd976d4c82b3c529786df13a81a3228d214c08d9ab95fb5a8b7f3ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3F 5324 bytes
font_01_sfnt_off00009039.bin
761517fc173a087b12057e90e27324a9be5bedc108a6c770f6b0813c7ef74acd
pdf-font-stream PDF embedded font (sfnt) at offset 0x9039 10456 bytes