Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a288d82f16cb43…

MALICIOUS

PDF

46.9 KB Created: 2020-07-30 20:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab49e0e2feb4ecb0d9c99d199378e137 SHA-1: a2e37fbe28a4ff40b11a7671ff262de161f242dc SHA-256: 87a288d82f16cb43b2351b1729e6c83b3868087a52322695d1137a0c3fec9b38
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Another critical heuristic indicates a PDF link farm, suggesting the document is part of a larger SEO manipulation scheme to distribute malicious content. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent to redirect users.

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=acuerdo+marco+codelco+pdf
    • http://files.egsdmusic.net/uploads/1/3/0/7/130740589/puduxedebes-jalawup.pdf
    • http://files.phaselinedefense.com/uploads/1/3/0/7/130738752/40b776c6174b.pdf
    • http://files.robertmckayjones.net/uploads/1/3/2/6/132681453/1388251.pdf
    • http://files.touchdowncollectibles.com/uploads/1/3/2/6/132682806/wepawesav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/zemipadutujisufevetige.pdf
    • https://cdn.shopify.com/s/files/1/0432/3944/0543/files/70169269847.pdf
    • https://cdn.shopify.com/s/files/1/0431/1996/8417/files/17286250090.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8759/files/83632584582.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xizujebekox.pdf
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/dolujenabarap.pdf
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/72027454705.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2456/files/47136084625.pdf
    • https://cdn.shopify.com/s/files/1/0435/8314/4093/files/vidusajijado.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6209/files/nobavabibemitipokawufima.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7067/files/kidav.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_off00007b03.bin
65e7c7aa70cb72319ccdb24a82dd1fe5ee41e6f7d2b92e557682b520abc90371
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B03 4760 bytes
font_01_sfnt_off00008b27.bin
5bd79aa7040afb5166c34e0b3f462524d50545f20c413516f6e5365462a5109a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B27 10476 bytes