Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff9fb7077496378…

MALICIOUS

PDF

43.9 KB Created: 2020-08-01 02:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1637d73cc9150cd5ede151034783f6b SHA-1: ec3a43184896ff2203e76013a3a335d585ab19b1 SHA-256: 0ff9fb70774963788964e13d2cbf52685aac413fbe16f17aa75df006c9f005b9
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector to 'https://ttraff.ru/pify?keyword=somebody%2527+s+watching+me+meme'. The document body, though heavily obfuscated, also contains this URL and references to a meme, suggesting a lure. The presence of numerous other links, many pointing to Shopify-hosted PDFs, indicates a potential link farm or content distribution strategy. The ML classifier 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.ru/pify?keyword=somebody%2527+s+watching+me+meme
    • http://files.chunkybrother.com/uploads/1/3/0/8/130874469/4056091.pdf
    • http://files.acecancercareinc.org/uploads/1/3/0/7/130739780/9944318.pdf
    • http://files.koppelmun.com/uploads/1/3/1/4/131438891/5694487.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/1842/6267/files/80263890583.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1522/files/59921168815.pdf
    • https://cdn.shopify.com/s/files/1/0431/5784/8224/files/25461767995.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0517/files/15454904956.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/sejikonemuremi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/98289547551.pdf
    • https://cdn.shopify.com/s/files/1/0431/4320/0929/files/11339521723.pdf
    • https://cdn.shopify.com/s/files/1/0434/2631/6455/files/77102998711.pdf
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/54500295986.pdf
    • https://cdn.shopify.com/s/files/1/0437/1359/3499/files/jack_lalanne_juicer_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/86224813861.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_off00006a7f.bin
25ab62d5bb2bb2babd118c5cda63c3ce19dee2365adfc46b95f1e595fa0ad7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7F 5696 bytes
font_01_sfnt_off00007ddd.bin
13d88a09a509833bb6cc12ff6a1a35fd3f22e39122cf5c1112da3c4d8580a41a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DDD 11156 bytes