Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fa3b6274b3d7cc…

MALICIOUS

PDF

123.0 KB Created: 2020-08-30 11:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61259221a371665556c27e466dd058ce SHA-1: 74bf0320730faaf12eea1dc96416b82fb2f4a0ce SHA-256: d4fa3b6274b3d7ccc9e2505942a988d4c68c8c164d707f10b3bb76c3c8bc15f4
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a link farm. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that a URL within the document points to known malicious redirector infrastructure. Additionally, PDF_SEO_LINK_FARM highlights the presence of numerous external PDF links, suggesting a tactic to artificially inflate search engine rankings or distribute content through a large number of seemingly benign PDFs. The primary IOC is the redirector URL, which is likely the initial step in a phishing or malware delivery chain.

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.com/wix?keyword=unidad+5+tercer+grado+2015
    • https://static.usrfiles.com/ugd/b8c837_c3432394b27c49f6849e96a7c898cee8.pdf
    • https://static.usrfiles.com/ugd/fd7405_f73f25c6df6940179345a4dd53864454.pdf
    • https://static.usrfiles.com/ugd/3e87bf_687c06a1cf1747c0bd45ca4ed80061c2.pdf
    • https://static.usrfiles.com/ugd/0aab01_f5c1ef749c474188a2588a29dfb910f8.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/kotefizatazofewuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/4564/9574/files/91093231868.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/kosamixazedototixez.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/18520879344.pdf
    • https://static.usrfiles.com/ugd/b8c837_8de2c3f5a3e14d688bca221f8f91ed6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_97f37fc9c1784e3aadce6cbab6f40feb.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d91c7dd2e1544299dda58d30677f2ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ed78aad2bad426683c752065a27b131.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/
    • https://static.usrfiles.com/ugd/b8c837_97f37fc9c1784e3aadce

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a05e.bin
b684646c0e1a8209fed7b6bba852c82ba0d9d6cb48fb993599b12d0bf190d914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A05E 5336 bytes
font_01_sfnt_off0001b29a.bin
03aa8c4a6f405360ed3a100c84207ddb760f04ce2b9af896652cf32efbbaab02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B29A 14492 bytes

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