Malicious PDF — malware analysis report

Static analysis result for SHA-256 02fa628b5d69ba73…

MALICIOUS

PDF

36.2 KB Created: 2020-08-30 01:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c23e83d18608f9c94350fbf3035be0f6 SHA-1: 0146704be2ad0c333dd1bb59b60bd6715ca6019e SHA-256: 02fa628b5d69ba732b37ada434279ca2ca5005e73670b45443876ca9d05d44ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to host or deliver further malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous links to external PDFs, many of which are benign, indicates a link farm strategy to potentially improve SEO for the malicious redirector. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/wix?keyword=mhw+guiding+lands+guide+reddit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0dd040_c0b4f5880224441e8b63b858e8aebcbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_43733c1196504b1db6c4a34a0a534cd8.pdf
    • https://static.usrfiles.com/ugd/b8c837_c762cac771034d9f9681d8e751bb0e0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2f9d3322edc4e20980356a1bc218064.pdf
    • https://static.usrfiles.com/ugd/b8c837_663a55f8981a44bc82b73d35778bb442.pdf
    • https://static.usrfiles.com/ugd/8127dd_fbd72a7493794235b0b0ab878c272acf.pdf
    • https://static.usrfiles.com/ugd/b8c837_0359343dc87846aa8fcf29998e796332.pdf
    • https://static.usrfiles.com/ugd/b8c837_3287f6c608f146e5b9d64f30e8c8d0a0.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_73f19bfa2b4f43e1b7db672923e0d655.pdf
    • https://static.usrfiles.com/ugd/6c98bc_0e4e3e4825b0450a85cafd6228f52a16.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_7d5729c656bd4cb28dfe492c15aea968.pdf
    • https://static.usrfiles.com/ugd/19103d_4ab5aa02552741fa9f9382a84c0a5e98.pdf
    • https://static.usrfiles.com/ugd/b8c837_b44f45c77d03440097d8429de3e8c9a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_5df9caff6de54f7495ebebf00a58924b.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/21160497083.pdf
    • https://cdn.shopify.com/s/files/1/0434/5833/0786/files/thick_leather_farming.pdf
    • https://cdn.shopify.com/s/files/1/0433/5871/6055/files/lowevovetijajafefegurik.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_off00005117.bin
f0ccc590199664a8075a44450b1d9385a7d67c5f40576d7578264355f7cf4cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5117 5184 bytes
font_01_sfnt_off000062c0.bin
e8d5c6cde037998bb42c3a4af6bd736cd0802b47c87d7ef6f301fc01bac17714		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C0 9712 bytes

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