Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c75c943caab3e16…

MALICIOUS

PDF

36.2 KB Created: 2020-08-10 02:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00798a98fd9b676439e6ac556a03177c SHA-1: 75cdf210689c51bfa00e0d73fd747c1c847e9a1a SHA-256: 9c75c943caab3e160abf61c0475ce4bf6ce13beb77954fd794e5e321da80d4b5
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'bisaya to english dictionary pdf'. The presence of numerous external links, many pointing to Shopify, suggests an attempt at SEO manipulation or driving traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=bisaya+to+english+dictionary+pdf
    • http://files.wanderlustlilies.com/uploads/1/3/1/4/131455283/jeteloriz.pdf
    • http://files.thenuttgallery.com/uploads/1/3/1/4/131438038/manupujufumesuwijavo.pdf
    • http://files.sunnysweetskin.com/uploads/1/3/1/6/131606782/7444873.pdf
    • http://files.stopovaryacting.com/uploads/1/3/0/7/130739616/padelo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugomedimugatusigoxafif.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6918/files/17827105415.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0904/files/gafogivejerufaxotof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/jofikuzolegano.pdf
    • https://cdn.shopify.com/s/files/1/0433/7169/2188/files/chicago_building_violations.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/jexebukosekoloxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/tv_paint_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5049/2316/files/259966082.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8411/files/60110620008.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_off000048a4.bin
c033af2a10f9db4eb1b030fe26ec7232e2b031bfe7003d4682fca19bf789f91b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48A4 5568 bytes
font_01_sfnt_off00005b9e.bin
8b4c8ac474415b97f159a36590369d808d05fee854cfa28a34da88fa4737e865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9E 13220 bytes

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