Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91dac30097872e1…

MALICIOUS

PDF

69.3 KB Created: 2020-11-06 05:29:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 859e7158d06eb1f3bc74c4f1fea6a77b SHA-1: b3d02f80b606882917a1b1794179f078a3d77c9c SHA-256: d91dac30097872e1365a5bd4141e0316487e818e9ddd9b1788a776103f339497
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to an accounting textbook answer key, suggesting a lure. The presence of numerous external PDF links further indicates a link farm or redirection scheme designed to obfuscate the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ggtraff.ru/123?keyword=accounting+1+7th+edition+answer+key+chapter+6
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/doxinofujuzezom_rusudofakutez_petasuredawag_mubunexigexazo.pdf
    • https://nonuvatemex.weebly.com/uploads/1/3/4/4/134443968/kekudegame.pdf
    • https://palifeselaliku.weebly.com/uploads/1/3/4/4/134441248/2ceb198b48b7.pdf
    • https://cdn-cms.f-static.net/uploads/4415951/normal_5fa33ad9f0a9f.pdf
    • https://vasabofilusav.weebly.com/uploads/1/3/4/5/134585229/gufuxivizowoku.pdf
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/3177289.pdf
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/0ab38a.pdf
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5f927f8725679.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bejokazemur/nptel_genetic_engineering_notes.pdf
    • https://uploads.strikinglycdn.com/files/c413743d-eca5-4446-9db2-3d0b1040178f/65602495387.pdf
    • https://uploads.strikinglycdn.com/files/8b70e27d-35b1-48d8-b3fe-f045310793cb/82415046661.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_off0000ccf1.bin
bc52491fc1a47aa9c68df060e0da20118138e797197300a690053564cc6fbbab
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 5836 bytes
font_01_sfnt_off0000e0f1.bin
c8d3d5b78361eb5a9e0f5415fb9c45d466f46f2c1a7ee0fac923f19652455f6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 11664 bytes