Malicious PDF — malware analysis report

Static analysis result for SHA-256 141cdda5231a2d4b…

MALICIOUS

PDF

33.7 KB Created: 2020-08-01 14:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4466416743cac438bb062f357a6298fb SHA-1: a82fb102b210a233a426fcaedff2ee9c5b00f79b SHA-256: 141cdda5231a2d4ba30609cea95e0afdcd3fd397006ca286cffe4a93196fef91
154 Risk Score

Malware Insights

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

This PDF document contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users searching for specific content. The presence of numerous external PDF links also suggests a link farm or SEO manipulation tactic. The ML classifier strongly indicates malicious intent.

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=billy+joel+keyboard+book+pdf
    • http://files.compasswellnesscoaching.com/uploads/1/3/0/8/130874543/1997618.pdf
    • http://files.jamfinearts.com/uploads/1/3/0/7/130738752/viwul.pdf
    • http://files.deesinhadesign.com/uploads/1/3/0/9/130969357/7927045.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wesuwalaloluxafim.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/73334278238.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6573/files/nevawuj.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8850/files/moxuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/1242/1789/files/32338160787.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/78709910949.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4156/files/91378189560.pdf
    • https://cdn.shopify.com/s/files/1/0439/9969/0910/files/zodobabofakupid.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/56981889128.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/41869091218.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/96675787745.pdf
    • https://cdn.shopify.com/s/files/1/0440/3711/1958/files/72375950066.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zilifevuzumojewod.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_off000046ab.bin
72e847622513e5f9f66d2ec01ff973e4fe89e653ac0109e26daee310cb36eb0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x46AB 5288 bytes
font_01_sfnt_off000058c3.bin
17734101447c5c5b39c9a6571ed66a7c55e1dd3b708bd7bb385e0c6681959022
pdf-font-stream PDF embedded font (sfnt) at offset 0x58C3 9876 bytes