Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bd4af08d8f27d3…

MALICIOUS

PDF

43.8 KB Created: 2020-09-17 17:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d5195cbea4e307d4f1da548faaf1564 SHA-1: 488e227bba7b7dd16f9d5845c8db3170abcdf442 SHA-256: 23bd4af08d8f27d3cedfd1ae4120e9f25520ee56f5ac9c435659c604493546a5
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body contains the URL 'https://ttraff.me/wix?keyword=club+answer+seoul', which is likely part of a phishing or scam campaign. Additionally, the PDF exhibits a link farm behavior, embedding numerous external links, many of which point to benign Shopify URLs but are likely used to obscure the malicious redirector.

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.me/wix?keyword=club+answer+seoul
    • http://sujaj.federfarm.com/uploads/1/3/0/8/130814328/ganup.pdf
    • http://pomop.studio38records.com/uploads/1/3/0/9/130969408/5730029.pdf
    • http://files.lostshapes.com/uploads/1/3/0/8/130814803/9133113.pdf
    • http://nudopav.boulderhighart.com/uploads/1/3/0/7/130776492/406e8520d6.pdf
    • https://cdn.shopify.com/s/files/1/0431/9730/0885/files/76458628441.pdf
    • https://cdn.shopify.com/s/files/1/0434/0727/8247/files/ccna_spanning_tree_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0433/6389/3416/files/mera_bhola_hai_bhandari_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0464/6027/2808/files/bsa_bicycle_merit_badge_requirements.pdf
    • https://4daf09a2-499a-40d7-bb8a-4276f0f45e5a.filesusr.com/ugd/e4a001_3d40615ba1d64b9f8862880d88709426.pdf?index=true
    • https://5c18c4df-031c-48ed-931a-8d20da4dedde.filesusr.com/ugd/fb5067_f153650bd4ab4ab3bd2b08b8c8390384.pdf?index=true
    • https://a9f7c87b-5719-441c-b208-2cc3b226867c.filesusr.com/ugd/70a38d_250f9cd59a834d2289d25657bc8361f1.pdf?index=true
    • https://d000bab8-93bf-429a-b732-955d0f2b4e46.filesusr.com/ugd/b42fd6_f786c4c4d3da4f05aaf21596f01e3139.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/tavutukejixonariwevexarog.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/81165323757.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4982/files/bushings_used_with_electrical_transformers.pdf
    • https://cdn.shopify.com/s/files/1/0437/5317/7237/files/17713533987.pdf
    • https://cdn.shopify.com/s/files/1/0433/6209/1163/files/14809793233.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_off00006e7f.bin
5104f146995563d3d29c5086f3f29fe34b919ef6bae6ae3adeac73d8bf4f40b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7F 4816 bytes
font_01_sfnt_off00007ef9.bin
4d110313a6125da31f2bd86e4f39aa1821cb6c45aa530e0688687b4de7c83c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF9 10420 bytes

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