Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c55793eebf94dd…

MALICIOUS

PDF

46.8 KB Created: 2020-08-07 17:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cae35e5ec77d8a71dd01c140820c288f SHA-1: 94bd6c11451edac81db27a2c6f5d7da8ca861628 SHA-256: 61c55793eebf94dd3f7d41b6c00513a21be25dafff13d3194caf6a6548abbb8e
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to lead users to malicious content. The document body, though heavily obfuscated, contains the same malicious URL and references a 'mobilcom debitel kündigung vorlage kostenlos pdf', suggesting a phishing lure. The presence of numerous embedded links to external PDFs, many hosted on Shopify, further supports the link farm heuristic.

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=mobilcom+debitel+k%25C3%25BCndigung+vorlage+kostenlos+pdf
    • http://files.timferriss.com/uploads/1/3/1/8/131856545/vonidil.pdf
    • http://files.cybersecurityinc.net/uploads/1/3/2/6/132681938/natuwafegaga.pdf
    • http://files.koasportsleague.com/uploads/1/3/1/3/131398288/5979001.pdf
    • http://files.joannapepin.com/uploads/1/3/2/8/132815343/ganojesimepijegi.pdf
    • http://files.revkristenkuriga.com/uploads/1/3/1/3/131380842/7808517.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5857/7051/files/salazaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/57762438504.pdf
    • https://cdn.shopify.com/s/files/1/0433/6667/8696/files/71630395450.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0231/files/mofazidam.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/datajomelixizowurad.pdf
    • https://cdn.shopify.com/s/files/1/0433/1657/6424/files/72431449529.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/femisa.pdf
    • https://cdn.shopify.com/s/files/1/0436/1230/7618/files/anticoagulantes_orales_y_parenterales.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13121593915.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/90034192242.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7999/files/dilola.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_off000071db.bin
0928e2786ace5f71afcb31def3ce53fbb6a60a63aa0c4327767cdad38387ab95
pdf-font-stream PDF embedded font (sfnt) at offset 0x71DB 5864 bytes
font_01_sfnt_off00008597.bin
eadbdf919d8d1f4e248cb12dbf41b4d1c40afa5030efc4195607296baca7c705
pdf-font-stream PDF embedded font (sfnt) at offset 0x8597 11496 bytes