Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c7a4726f88f4f7…

MALICIOUS

PDF

41.0 KB Created: 2020-08-15 07:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 733a8cb8b73492bd2f2525a01e7ae703 SHA-1: 0cd0304660ded8519ce05a850cfa0cd09e3ab664 SHA-256: c3c7a4726f88f4f7c55e7a88265825e98a68e6a655f2f62ede6d4cd11de878c1
120 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector service, which is a common technique for distributing malware or phishing pages. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, identifying a link to traff.ru. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which are to Shopify-hosted PDFs, suggesting an attempt to manipulate search engine results or distribute content widely. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector.

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.ru/pify?keyword=probability+worksheets+grade+6+pdf
    • http://files.xerobol.com/uploads/1/3/1/3/131378776/naxapabusani.pdf
    • https://cdn.shopify.com/s/files/1/0438/2277/6480/files/sorumuwowaw.pdf
    • https://cdn.shopify.com/s/files/1/0436/0421/3917/files/indiana_cdl_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9177/8965/files/the_bassoon_king_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/3949/6094/files/aiou_solved_assignment_autumn_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/day_by_day_dog_training_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/1654/2632/files/kufadobeko.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5029/files/matplotlib_save_figure.pdf
    • https://cdn.shopify.com/s/files/1/0438/2952/6688/files/7243554213.pdf
    • https://cdn.shopify.com/s/files/1/0432/0421/4942/files/73928883497.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://cdn.shopify.com/s/files/1/0439/394

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000600c.bin
865163ca223d0b8bf16cf090da27c8fbe67dbd55d43dad110b07057ed101d626		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600C 5856 bytes
font_01_sfnt_off000073fe.bin
33b89d2bb3000c2301248c064a453f2b1bbfa84c53e9513be0f524954a0970f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FE 10344 bytes

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