Malicious PDF — malware analysis report

Static analysis result for SHA-256 7655f8baad3c9112…

MALICIOUS

PDF

37.9 KB Created: 2020-08-12 03:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a1c43b5a3354c7357650aa96bb47141 SHA-1: 626a69f8a5063105d82dda01a327d38a92b9d736 SHA-256: 7655f8baad3c911296178d036c9b922e0648862b8cf196c137255f81ef53dcce
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link redirects to known malicious infrastructure at ttraff.ru. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded links are the primary vector for malicious activity.

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=acls+pocket+reference+card+set+pdf
    • http://files.dymonfitness.com/uploads/1/3/1/8/131871692/jobonamawaxapeso.pdf
    • http://jorijo.theburrs.org/uploads/1/3/0/8/130814921/0883c7c80.pdf
    • http://xokefase.mantra-translate.org/uploads/1/3/0/7/130738837/f0070d84b950010.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1306/3335/files/61012479499.pdf
    • https://cdn.shopify.com/s/files/1/0433/7208/5406/files/latapapamidejosonafiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/35436370029.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/gojojo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2038/4416/files/ntel_82562v_10_100_network.pdf
    • https://cdn.shopify.com/s/files/1/0436/9989/6475/files/43007259111.pdf
    • https://cdn.shopify.com/s/files/1/0432/9809/5262/files/jixarejiwiduf.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/91050180988.pdf
    • https://cdn.shopify.com/s/files/1/0437/9197/4557/files/55287653767.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1609/files/seiken_densetsu_3_class_change.pdf
    • https://cdn.shopify.com/s/files/1/0430/5112/2842/files/60587198817.pdf
    • https://cdn.shopify.com/s/files/1/0439/3772/6622/files/64097212785.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_off000054f5.bin
56e352fa2eb439b9ff65ef82311fc0b0a53e7c78ad92c5ef710eb4d2f21cdeab
pdf-font-stream PDF embedded font (sfnt) at offset 0x54F5 5200 bytes
font_01_sfnt_off000066ae.bin
c646ad20b284fb65706cc71950c161dde4f93f5cf0d88e98b4379e67976b23f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x66AE 10840 bytes