Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4006781082d172…

MALICIOUS

PDF

40.8 KB Created: 2020-08-02 04:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90caa42defc7b60f538d5d88ccfea6f8 SHA-1: 0ab6c8779b29c61c11ff326ce3b1069e04becd64 SHA-256: 0a4006781082d1728dab83c4260d4fcdd856dea2b3723c9a3e9eb8b42e131d86
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 what appears to be a link farm designed to host other PDFs. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination. The document body, though heavily obfuscated, contains text related to financial management and the tool used to generate the PDF, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the presence of numerous links and the redirector heuristic strongly suggest a phishing or redirection attack.

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=financial+management+theory+practice+15th+edition+pdf
    • http://files.dqnv.org/uploads/1/3/1/6/131606367/699701.pdf
    • http://files.thewritereflection.com/uploads/1/3/1/3/131382808/db232f574.pdf
    • http://files.wessidevibrationsinc.com/uploads/1/3/1/4/131437312/5505649.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8229/3151/files/maxavalemafisarumav.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/93126253444.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/29255819051.pdf
    • https://cdn.shopify.com/s/files/1/0437/6916/8021/files/45762227682.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1056/files/nedonarazuru.pdf
    • https://cdn.shopify.com/s/files/1/0437/2067/1384/files/95256351999.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/fr7_hall_of_heroes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/31022830464.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1987/files/kuvajokepegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2799/6565/files/tokes.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/gikigejewabegowizumoxi.pdf
    • https://cdn.shopify.com/s/files/1/0449/1676/8923/files/siri_0_0.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_off00005ee5.bin
810c6154f1c37f44941f26523897f0ab47efe042e88ed4603a674f38b7fdda7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE5 5624 bytes
font_01_sfnt_off000071f1.bin
f963f29cbe124c92a89c0b519b5fa8f1e1afc723f0adcf24bd4cf82f2275cd3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F1 10548 bytes

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