Malicious PDF — malware analysis report

Static analysis result for SHA-256 a079539f183cab8d…

MALICIOUS

PDF

41.6 KB Created: 2020-08-14 23:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e8c9888d35b7fab7480504dede1a604 SHA-1: c21619b50c7c3f52e9ffe2358852b5b19778a90c SHA-256: a079539f183cab8d087dbd7369bf03050663ddab81fa3b83327129294a4ca1b9
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/wb?keyword=bedenkenanmeldung%20vob%20pdf, which is flagged as malicious. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests an attempt at SEO poisoning or a link farm to distribute malicious content.

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=bedenkenanmeldung%20vob%20pdf
    • http://files.mtalamasleal.com/uploads/1/3/2/6/132696112/2964229.pdf
    • http://files.icarusdesigns.com/uploads/1/3/2/3/132303245/4982592.pdf
    • http://files.whitechocolatephotography.com/uploads/1/3/1/4/131454116/vozaxilag_pavunerumiraka.pdf
    • https://cdn.shopify.com/s/files/1/0437/8945/1425/files/dopoja.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/install_aws_cli_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/9179293787.pdf
    • https://cdn.shopify.com/s/files/1/0430/7461/7511/files/xenosibuse.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/pajujuru.pdf
    • https://cdn.shopify.com/s/files/1/0430/2998/7489/files/soser.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2536/files/verusuledotejejapom.pdf
    • https://cdn.shopify.com/s/files/1/0432/5729/9097/files/wotujunejoramuwab.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/48202487845.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/descriptive_geometry_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/5725/0455/files/7486936657.pdf
    • https://cdn.shopify.com/s/files/1/0435/6171/3813/files/65480420189.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/87812854439.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000586f.bin
78b684444446af32de4e2cb20f439331876a8ec7c9b51e5705747a4aab45b257		 pdf-font-stream PDF embedded font (sfnt) at offset 0x586F 5152 bytes
font_01_sfnt_off000069e8.bin
bb6f93cb4fe9fe333e9f4f56cac369d42134b4f1c028b56c7ca3b8655fe5a447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E8 9776 bytes
font_02_sfnt_off00008b60.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B60 4324 bytes

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