Malicious PDF — malware analysis report

Static analysis result for SHA-256 b170a8171b321833…

MALICIOUS

PDF

60.0 KB Created: 2020-09-03 02:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90b2a3c73497b8febbf333cc716424f6 SHA-1: 92540e0695c5e74a9efcb85593ba6b83dfac792c SHA-256: b170a8171b321833339d20a6c92bcd78075153f7195e661f813600167afb37a6
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.club'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The file also exhibits characteristics of a link farm, with numerous external PDF links, many hosted on static.usrfiles.com, likely to obscure the malicious redirector. The primary malicious IOC is the redirector URL.

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=dragon+age+inquisition+quests+guide
    • https://cdn.shopify.com/s/files/1/0434/1796/0600/files/14088322775.pdf
    • https://cdn.shopify.com/s/files/1/0434/5026/9849/files/small_protector.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8782/files/nokajadesolutujibivimur.pdf
    • https://cdn.shopify.com/s/files/1/0436/6991/3753/files/main_features_of_academic_writing.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdc032211353441aaf2642c7d3f9f21f.pdf
    • https://static.usrfiles.com/ugd/7921d2_61af086c84064e03b0a4486f44ffa354.pdf
    • https://static.usrfiles.com/ugd/7ff653_bf8e2b4455d2410cbb0ffaa0e7b851d8.pdf
    • https://static.usrfiles.com/ugd/b4a829_471b794be6414c108da8072ebbfbc11b.pdf
    • https://static.usrfiles.com/ugd/f515ca_201e8eaed7984294b413d87354f25b1c.pdf
    • https://static.usrfiles.com/ugd/3de8a6_f915ec8d88664082a31b4619220f56df.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_3df5147e4c034814a86c50b4b38cf9c1.pdf
    • https://static.usrfiles.com/ugd/a18aa6_7be90373ae0a4fedbd595d0ae31c708a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c1a72f478274a3a9d3b3b354938a919.pdf
    • https://cdn.shopify.com/s/files/1/0434/0164/2135/files/cerveza_bufalo_de_nicaragua.pdf
    • https://cdn.shopify.com/s/files/1/0437/2296/5160/files/14588650212.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_off0000ae40.bin
2804e78308b04758186ec329a9c4ce448169274755c969bb1a8936f76c7b05e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE40 5088 bytes
font_01_sfnt_off0000bf92.bin
1664e6de23023fff4f70ff33570602aa34e5b4b8994691414488142772f0a88c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF92 10308 bytes

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