Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ea03c4824b27d9…

MALICIOUS

PDF

54.6 KB Created: 2020-08-11 16:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 201b56be8e1d952613139b126a4f194d SHA-1: 15cd16972eabc5bcf9ce04b1f60646245e8477da SHA-256: e3ea03c4824b27d9bfd695a35e8bf0be91468f5e83787210dfdb287d50402599
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text fragments including the target URL and references to 'wkhtmltopdf', suggesting it was generated by a tool. The presence of numerous external links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=biogeography+articles+pdf
    • http://files.franklinpaint.com/uploads/1/3/0/8/130874627/24d91ea6.pdf
    • http://files.buscogoodnews.com/uploads/1/3/1/4/131407665/d8d880b62.pdf
    • http://files.loumurreyphotography.com/uploads/1/3/1/8/131856186/saburufutada_moguvakila.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/masexaperupegetabegat.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1563/files/13778111426.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2383/files/zofapidaxetovavodubot.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/82141063362.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/25949326039.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/85090727745.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/13961952726.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2799/files/48600843828.pdf
    • https://cdn.shopify.com/s/files/1/0433/9512/1319/files/the_chive_instagram.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/pink_ping_pong_ball.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tekutuni.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68769425665.pdf
    • https://cdn.shopify.com/s/files/1/0432/4596/1383/files/jodumatapirijetafapize.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43127542751.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_off000095b9.bin
d196db0c2d4d04fefb73e9a0cc9402cbe68ce0a7eb22ceba71da30d875a7ffd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95B9 5568 bytes
font_01_sfnt_off0000a8a4.bin
456697af5e18cf168dd5419340ce0d4bfdd740a966dc43740a9a4ba09947d041		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A4 11028 bytes

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