Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb91793bacbc3dc1…

MALICIOUS

PDF

34.0 KB Created: 2020-08-23 04:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c29aceef8e73c05d8ce5ba61d7b885d2 SHA-1: 19e04ed10a28efa0e3f5dcfa4d6d832a7301191b SHA-256: bb91793bacbc3dc1c9b6d03fef6a8fef382f5ac9b05772e2287912e6cdbc1abe
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. Additionally, it features a PDF link farm, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The primary malicious URL identified is ttraff.com, which is used in conjunction with a keyword that appears to be a lure. No scripts were extracted, but the presence of multiple embedded URLs points to a redirection-based attack. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/pify?keyword=callan+method+stage+3+pdf+chomikuj
    • http://files.mckenzieareadayhomes.com/uploads/1/3/1/4/131453894/937327.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/malayalam_kambikatha.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/98974449165.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2948/files/kisumadiwarogukoxakigivi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/poe_leveling_uniques.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7206/files/501c3_church_exposed.pdf
    • https://cdn.shopify.com/s/files/1/0431/7252/8292/files/tceq_above_ground_storage_tank_registration_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/23814233056.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/91908894668.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/6958529137.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1274/files/rawexobowu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4500/3169/files/nilibimubobage.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_off000049be.bin
a330f520de14be67992170a6c900ce0252b6297dc23caa0f5546ce9c53a3e1af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49BE 5684 bytes
font_01_sfnt_off00005d01.bin
1f285ee8ebc0a40ad94ad3021c7a47f9512951307f122aa2f0f10a0b4701628b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D01 8964 bytes

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