Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f60ae26ac6a0cd…

MALICIOUS

PDF

44.4 KB Created: 2020-08-15 14:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e0c0b914f70076361d06c9847a33068 SHA-1: c3221cb26676061113d4099f82d41000fc84c64e SHA-256: 76f60ae26ac6a0cd85b6c83167024e8d59a3f462a1ff924cb87622f51109d51a
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to disguise its true purpose. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=stream+tv+shows+app+android
    • http://files.kriloart.com/uploads/1/3/1/4/131437753/nolovi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3494/3388/files/nifenadeko.pdf
    • https://cdn.shopify.com/s/files/1/0431/3828/5725/files/56934991732.pdf
    • https://cdn.shopify.com/s/files/1/0431/8724/1119/files/access_consciousness_clearings.pdf
    • https://cdn.shopify.com/s/files/1/0428/1958/4166/files/12026686794.pdf
    • https://cdn.shopify.com/s/files/1/0437/3427/0101/files/15925823138.pdf
    • https://cdn.shopify.com/s/files/1/0432/8967/3883/files/13434925604.pdf
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/active_passive_advanced_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0440/8170/9206/files/68341172044.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/kagaxuwijufanapixilizupur.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6895/files/gibipikutumuxavosepoju.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.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_off00006fd6.bin
75e7f67caa10f4798f1a9db94104c6848e520328279085bad4c0d503a9d05641
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD6 5420 bytes
font_01_sfnt_off0000822f.bin
17c721e11242fe8283afd73dae6db2bc221248f90e08d5205be6b9fe1017c57b
pdf-font-stream PDF embedded font (sfnt) at offset 0x822F 10196 bytes