Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1af53a6f8d36f9…

MALICIOUS

PDF

62.5 KB Created: 2020-08-11 18:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5e212ff2c3ab8bac56bb11b873659a9 SHA-1: 6f87c7706f46693b4caa812fc7635fb4c03fb9d3 SHA-256: 4c1af53a6f8d36f963b01ac5fd71b3b7305139c295ba8d7635f6f4d4a9a25b17
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious URL. Additionally, PDF_SEO_LINK_FARM suggests the document is part of a link farm designed to attract traffic. The embedded URL https://ttraff.ru/wb?keyword=fortress%20besieged%20english%20pdf is the primary indicator of malicious intent, likely serving as a gateway to further malicious content. The document body, though heavily obfuscated, contains this URL and other links, reinforcing the link farm and redirector attack pattern.

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.ru/wb?keyword=fortress%20besieged%20english%20pdf
    • http://files.logcabinrental.ca/uploads/1/3/0/7/130738701/48ab9.pdf
    • http://files.fwsomusicians.org/uploads/1/3/1/1/131163667/nemipibumi.pdf
    • http://files.californiadaylilies.com/uploads/1/3/1/3/131381919/4690694.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8849/files/mopop.pdf
    • https://cdn.shopify.com/s/files/1/0433/1061/2635/files/rezuzitosad.pdf
    • https://cdn.shopify.com/s/files/1/0434/7081/5397/files/simple_business_plan_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4828/files/57421067093.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/chuck_mangione_feels_so_good.pdf
    • https://cdn.shopify.com/s/files/1/0430/5318/7221/files/29342895299.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/25911203424.pdf
    • https://cdn.shopify.com/s/files/1/0432/2692/3172/files/lezuvipomavekodotasi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/wedozi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/joxemikajawu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80789229335.pdf
    • https://cdn.shopify.com/s/files/1/0440/0214/8510/files/juniroxa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072cf.bin
03b429f8d60d6c2bd9ad04e61f347ee8eaeee89458bdbd1bc6a99717e39b248a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CF 17812 bytes
font_01_sfnt_off0000ab08.bin
41012390c9a9eec104274a2b246d0e1616e421f957f9c6dda80020b635a5bd66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB08 4976 bytes
font_02_sfnt_off0000bbe3.bin
cc1516ee15d37a45386a5bd41441afbef6a10534a620294d1b121f99fae8b915		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE3 10452 bytes
font_03_sfnt_off0000de9f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 4324 bytes

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