Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd8b85e8868b442…

MALICIOUS

PDF

39.2 KB Created: 2020-08-24 20:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4753d9c15ea99d77374f0e1dafbb6306 SHA-1: 54d39636273f16663325b4dc636f9dd5afd3b74c SHA-256: 5dd8b85e8868b442fdad94dade09697f205d3c2a0735b362f93ad2940327ac72
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of embedded URLs and the redirector heuristic point to a phishing or malware distribution attempt.

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=corporate+ownership+structure+template
    • http://jaketafa.hairymosquito.com/uploads/1/3/0/9/130969690/bofoz.pdf
    • http://tawesu.theallinallministries.com/uploads/1/3/1/3/131380183/kokap.pdf
    • http://files.roaming.studio/uploads/1/3/1/3/131383775/wikojisadoxutabuk.pdf
    • http://tilopif.poloprague.com/uploads/1/3/1/6/131636664/saxarunos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73470001672.pdf
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/second_shift_arlie_hochschild.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/preservation_of_archival_materials.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/makkar_ielts_speaking_2020_download_september_to_december.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/siwop.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/fimutidoletotogesuji.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/77146313655.pdf
    • https://cdn.shopify.com/s/files/1/0437/5078/5173/files/autoestima_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0434/9201/6280/files/dukorusijebowapadapezipom.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_off00005e84.bin
dd281c58d590801c15c34ad3f0046ecc37621fb6bcbdd2e4b315c5d83b54a58b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E84 5172 bytes
font_01_sfnt_off00006ff3.bin
a3cd717a2ee8be8bfbaebe6d5caf4a5afb292f17e0ce8d300b22328f82bfcdd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF3 9452 bytes