Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f918fcf2196987…

MALICIOUS

PDF

50.1 KB Created: 2020-08-01 19:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21c1c4e5dbb1cbdc6a77dc8e1839edf8 SHA-1: e5610780f4b1f20b502af54b6cd6a6bbe061064d SHA-256: 05f918fcf2196987f6c6b5ae04c2bc57350c5cea92a45595b5cc35267ea05074
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=list+of+cities+in+kansas, suggesting a lure to a malicious site. The presence of many external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content.

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=list+of+cities+in+kansas
    • http://files.mysaintbarx.com/uploads/1/3/1/4/131406827/suzumik-nekipokijev-sekaz-tefekikas.pdf
    • http://files.yongintaekwondocollege.com/uploads/1/3/0/8/130814980/2644989.pdf
    • http://files.sacontracting.org/uploads/1/3/1/4/131437149/gutabi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/ramenosid.pdf
    • https://cdn.shopify.com/s/files/1/0428/5179/5107/files/67950205898.pdf
    • https://cdn.shopify.com/s/files/1/0435/3468/0216/files/reludibu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3368/0282/files/68791062781.pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7605/files/viveruje.pdf
    • https://cdn.shopify.com/s/files/1/0437/3128/8216/files/43861724879.pdf
    • https://cdn.shopify.com/s/files/1/0430/7740/2778/files/xavalalawemenolesowiremi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/zadoxabikiremoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5090/1402/files/wamom.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/39394157673.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_off00007cb7.bin
690439c80fd2a0e1c3805f8fb539f031d5ffa48eae5a17279901769d0ad6a58c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB7 4752 bytes
font_01_sfnt_off00008d03.bin
e9b17874d67405583d43bb224ff8aed58ed6b0248cfad7d257af78c8e4d1a407
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D03 15080 bytes