Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aa30d774fce470…

MALICIOUS

PDF

43.0 KB Created: 2020-08-12 14:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d72f3a43d56d960c93f56d633a09c48c SHA-1: 15c1d722323f0d70f3fd01d0f88b4f8a28d06059 SHA-256: a6aa30d774fce470ee49700a9089fcc3ae89b1fcd0dc819c0bb2de8370c6a961
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=anatomy+physiology+and+pathology+by+body+systems+pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The presence of a large number of external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector. No scripts were extracted, but the embedded URLs and the ML classifier strongly indicate malicious intent.

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.cc/pify?keyword=anatomy+physiology+and+pathology+by+body+systems+pdf
    • http://porir.kingdomkeyholders.com/uploads/1/3/0/8/130873826/ravimedewun.pdf
    • http://japabefo.grammardesigns.com/uploads/1/3/1/6/131606490/xanotu_vugadufibi_babilukujupe_mabavepi.pdf
    • http://files.moonriverdesigns.ca/uploads/1/3/1/3/131381607/c681c8.pdf
    • http://files.lonestarcarpetcare.com/uploads/1/3/1/4/131409090/fedopif-bowonevomopo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/58337931625.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/62436862527.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/zinofir.pdf
    • https://cdn.shopify.com/s/files/1/0434/7281/4245/files/galujukekujisosasa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/xolejufonegogitas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30151397197.pdf
    • https://cdn.shopify.com/s/files/1/0437/4475/5866/files/82334250932.pdf
    • https://cdn.shopify.com/s/files/1/0429/1090/8572/files/resod.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/13851364516.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/sokifitukopel.pdf
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/lidotogagapizemikuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/8748/7395/files/titemesafasiferebak.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_off000065f2.bin
63f438be67ee062a3ac437ac30861ebaf0a319e26fcd725c36cbe59cbf00e1ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F2 5588 bytes
font_01_sfnt_off000078cb.bin
ccab0bac6987a26755d565a3e1d763656593e69dd2f5e6dd480498bb398a7959		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CB 10448 bytes

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