Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9935b42465edd66…

MALICIOUS

PDF

59.8 KB Created: 2020-08-19 13:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 291f4a29fbf2768fe47d92485424cbed SHA-1: 7984784cf19e519703d797b72c972e2a4cd25cb8 SHA-256: d9935b42465edd66b09c69b39127e46620b7293432e146cd2071ef5bf3758e93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=anticonvulsivantes+efeitos+colaterais+pdf, which likely serves as a gateway to further malicious content or phishing pages. The document body, though heavily obfuscated, also contains this URL and other links pointing to Shopify-hosted PDFs, suggesting a link farm or SEO spam tactic to drive traffic to malicious sites. No scripts were extracted from this sample.

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/pify?keyword=anticonvulsivantes+efeitos+colaterais+pdf
    • http://bawube.jadepublishing.org/uploads/1/3/0/8/130814328/2474696.pdf
    • http://files.chocolatedudeabq.com/uploads/1/3/1/4/131407709/c81fe69bcce.pdf
    • http://files.wrobertconnor.com/uploads/1/3/2/3/132302814/xelivofaleletukip.pdf
    • http://files.ysgolcybi.com/uploads/1/3/0/7/130775959/9442c4f94.pdf
    • https://cdn.shopify.com/s/files/1/0436/5965/7374/files/93825850975.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3493/files/51221143031.pdf
    • https://cdn.shopify.com/s/files/1/0430/0531/3177/files/pupemevu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/boruxunijutaki.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/coleman_powermate_5000_generator_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8954/files/73529113477.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/nakosiva.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7746/files/exe_has_stopped_working_meme.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/apa_citation_style_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/78654666238.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/mamenexulupofejubide.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_off0000adad.bin
7817b8079e46822d94d45f649c8a5361f01033bdfde0cc0ac0ec3c5ef7d98255
pdf-font-stream PDF embedded font (sfnt) at offset 0xADAD 5196 bytes
font_01_sfnt_off0000bf6c.bin
573a5fc7449e3303f495cf3c2c6d313d72a9455efd16ddf7b2defb4317cec0e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6C 10028 bytes