Malicious PDF — malware analysis report

Static analysis result for SHA-256 255bc2c2ac1da9b6…

MALICIOUS

PDF

46.4 KB Created: 2020-08-05 03:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd5d037b9daf0607efc4a79d772b24d4 SHA-1: 69b5c55cd760b9ca131539d5783ba11d9c1233c4 SHA-256: 255bc2c2ac1da9b681a10e7b8cdada54a0921331fdd75f79677b327b9325c2ef
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=human+trafficking+law+in+myanmar+pdf`. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to redirect the user to malicious content. The ML classifier also strongly indicated maliciousness.

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=human+trafficking+law+in+myanmar+pdf
    • http://mizinevu.cricstudios.com/uploads/1/3/1/4/131406893/4202872.pdf
    • http://files.christiestimber.com/uploads/1/3/2/3/132302815/a80bec9c772bc.pdf
    • http://files.stlpti.com/uploads/1/3/0/8/130813111/wubawexixew-mufifotusal-kanofigira-gokedo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63491738983.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/53091912883.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/57601748327.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/99823235274.pdf
    • https://cdn.shopify.com/s/files/1/0438/2828/1506/files/50301508457.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/castrol_oil_specifications.pdf
    • https://cdn.shopify.com/s/files/1/0430/3192/0794/files/about_schmidt_script.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mefawubizujoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/7190/5698/files/ruzamegilenizejijuwomo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/12167079583.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000783a.bin
0e0155ea193b9ab116a39ec7b6aac8e9ddd876990d9215747728d5ec2c0ed046
pdf-font-stream PDF embedded font (sfnt) at offset 0x783A 5516 bytes
font_01_sfnt_off00008aff.bin
14c3c5a80ccb5e2b8d460915292519c5fecbc6a0bec8cdb7d78be81636573a4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFF 9980 bytes