Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9484c15ea728b4c…

MALICIOUS

PDF

43.1 KB Created: 2020-08-11 04:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59637dc0a87c8ca1fa30f26c97c4be69 SHA-1: a4d44adf44b401132a703d2b5c2dd4005d96ac60 SHA-256: a9484c15ea728b4c84ed52bd9bd5c6a0725399e01ef35b7d87e73d1e52c79246
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=borges+short+stories+pdf'. This URL is presented within the document body, disguised as a search query for "Borges short stories pdf". The file also contains a PDF link farm heuristic, indicating it is designed to host numerous external links, many of which point to benign Shopify URLs, likely to mask the malicious redirector. No scripts were extracted from this sample.

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=borges+short+stories+pdf
    • http://files.weatherfordobgyn.com/uploads/1/3/0/7/130739398/90048.pdf
    • http://files.us-msminer.net/uploads/1/3/1/1/131164112/savowijimilexoz.pdf
    • http://files.andreagiordanomusic.com/uploads/1/3/2/3/132303028/c9f273625a006.pdf
    • https://cdn.shopify.com/s/files/1/0438/1173/3664/files/200_top_electrical_engineering_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/vepajamupukewafepolos.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6689/files/16832786173.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/46907900995.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9037/files/vixojefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4005/5208/files/83105584883.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2099/files/cervical_herniated_disc_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/4615/0039/files/94386582509.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/68545090756.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9573/files/10573312374.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/bigojapuzumaxatodanaxozo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7391/9393/files/12609953392.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_off00006a8e.bin
650ef5a3f83946334325caf429616acd379ea0493d1df788d274c36238130d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8E 5108 bytes
font_01_sfnt_off00007bf0.bin
d2e49d66b181f7a0b3188f47534b6d8e3e990db52979adedd75d04cd467f7a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF0 10540 bytes

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