Malicious PDF — malware analysis report

Static analysis result for SHA-256 12123bca5ca85a2b…

MALICIOUS

PDF

42.2 KB Created: 2020-07-10 20:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aebf71100e57b9db96b20fdc030cdd20 SHA-1: 145b4a4fd9756e7e4e7d09aaa03760e07e495a33 SHA-256: 12123bca5ca85a2b908ba12ddfd4bc411fcef99fbe830627888247a469f11a00
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links that point to external PDF files, many of which are hosted on suspicious domains. One prominent link redirects to 'ttraff.ru', a known malicious redirector. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the embedded links are the primary attack vector.

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=cctv+camera+details+pdf
    • http://files.starkeyoutdoors.com/uploads/1/3/1/4/131452794/joxuvalus.pdf
    • http://files.sustainableartschool.org/uploads/1/3/2/6/132682819/fufim-manowuw.pdf
    • http://files.adelaide-pilates.com/uploads/1/3/0/7/130775151/6c5a292706.pdf
    • http://files.joannaruhl.com/uploads/1/3/1/3/131379789/8870089.pdf
    • http://files.dlfinancial.org/uploads/1/3/1/3/131379749/tobij.pdf
    • http://files.cobilconnect.com/uploads/1/3/0/9/130969853/6ea8d66a.pdf
    • http://files.akilamstudio.com/uploads/1/3/2/6/132682565/dufojumam-sosufiwi.pdf
    • http://files.ibteens.net/uploads/1/3/1/3/131383358/faxurugisuvuvef.pdf
    • http://files.laanimal.com/uploads/1/3/1/3/131398164/6d1247d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vagiseni.files.wordpress.com/2020/06/zabirevi.pdf
    • https://gorowedezer.files.wordpress.com/2020/06/474963070.pdf
    • https://wuwiwil.files.wordpress.com/2020/07/setukoforamuvoximelone.pdf
    • https://wikasiset.files.wordpress.com/2020/07/74430910228.pdf
    • https://guganogu.files.wordpress.com/2020/07/41764598761.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69901941500.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/82365171426.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/16625140795.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_off0000694d.bin
26b2cf42cbdccf2ef11093f7ff030c1bdf67747d78255a6bd105dd5f4451c134
pdf-font-stream PDF embedded font (sfnt) at offset 0x694D 4956 bytes
font_01_sfnt_off00007a2f.bin
1476c0f8d0e3adb05c201331001c05cea8964e301986c470a61f582b2a97ce81
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2F 10008 bytes