Malicious PDF — malware analysis report

Static analysis result for SHA-256 522b7108d8d68cdb…

MALICIOUS

PDF

41.7 KB Created: 2020-09-09 11:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7159946f56a01adad63f2dcb4af35ae3 SHA-1: d3c95e04d9d06f9cb0d5137d73fb8906e1a661cc SHA-256: 522b7108d8d68cdb52a41ebcc0c706435fdad85eb17f9ed2c73cace1fab45859
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which points to 'ttraff.club'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The file also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, likely to improve search engine ranking and distribute traffic. No scripts were extracted from this sample.

Heuristics 3

  • 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.
  • 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.club/wix?keyword=chemical+bonding+questions+and+answers
    • https://cdn.shopify.com/s/files/1/0438/1841/8333/files/search_doc_on_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/4126837293.pdf
    • https://cdn.shopify.com/s/files/1/0435/0279/6964/files/abstract_reasoning_test_epso.pdf
    • https://cdn.shopify.com/s/files/1/0430/9339/3557/files/fiwupufinokivut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83406059157.pdf
    • https://static.usrfiles.com/ugd/912de2_80c14ec9c03644159844a0b79086dfda.pdf
    • https://static.usrfiles.com/ugd/d1fcfc_343f16f5131a40bc9a5879187e7cfe7e.pdf
    • https://static.usrfiles.com/ugd/1ee69b_f58afb24c7c749f889b0c9f33a15aa35.pdf
    • https://cdn.shopify.com/s/files/1/0462/2771/8293/files/dhhs_policy_funding_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0436/5916/5849/files/drama_korea_brilliant_legacy_batch.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/xiguxoguretekalu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5064/6169/files/diltiazem_davis_drug_guide.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_off000061c4.bin
d09311240d2e855ff3869af7ea1472ca74a4d60313b13279e0b1bbb6e700e1fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C4 5616 bytes
font_01_sfnt_off000074ac.bin
9909daccc1b944462ba9116e7c2564686a695fc44dbf63e070acb273a26a3114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74AC 10996 bytes

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