Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bea39946fd9a556…

MALICIOUS

PDF

44.6 KB Created: 2020-08-03 11:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76ec0ef7de8817067d2141021d5437eb SHA-1: 55af9350987e7af06dc5af12f28f906b069c45dd SHA-256: 5bea39946fd9a556b260653c7ad3eaac38901136f228dcc69c0cff17b41fafc3
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 Shopify domains hosting other PDFs, suggesting a link farm or SEO abuse. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious objective. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of embedded URLs and the redirector heuristic points to 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.ru/pify?keyword=for+your+glory+tasha+cobbs+download
    • http://files.nadianiyazi.com/uploads/1/3/0/8/130814596/6870909.pdf
    • http://files.campingdeberghoeve.com/uploads/1/3/0/7/130776821/nojiwufoxu.pdf
    • http://files.dialyzermedicals.com/uploads/1/3/0/7/130775363/6350989.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8754/3964/files/misasonu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5625/8454/files/guxefojevezuruz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/30474850659.pdf
    • https://cdn.shopify.com/s/files/1/0433/0261/7252/files/altec_lansing_vs4121.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/57787838214.pdf
    • https://cdn.shopify.com/s/files/1/0437/7952/2722/files/80978995865.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/32452510297.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1965/files/con_funk_shun_love_s_train.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/77465961778.pdf
    • https://cdn.shopify.com/s/files/1/0434/6439/2866/files/rixibusadimizunojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/dj_air_horn_sound_effect.pdf
    • https://cdn.shopify.com/s/files/1/0430/7058/7029/files/gixinufoxowamefonefo.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_off00006f37.bin
24bce816bd05d36ab8732250640d11d423e4b0435d431934eb7d3affd2c39527		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F37 5488 bytes
font_01_sfnt_off000081f7.bin
67e75b1e191fc3f81a7c1b6cc145a3e8a28c82204d1e1eb08060f8db23f5f7a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F7 10428 bytes

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