Malicious PDF — malware analysis report

Static analysis result for SHA-256 813a7528fc1618ff…

MALICIOUS

PDF

95.0 KB Created: 2020-08-07 14:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a02c17d5abfa7c7afb8c4972169521f SHA-1: 8eaa0eda69e71061d7864c0015886c718de4abf5 SHA-256: 813a7528fc1618ff0cbbe7252be4e86f10cacff51c038d582367098a149ddebf
120 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to external PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, 'ttraff.ru', which is presented in the document body as an 'astrological calendar 2020 pdf'. This indicates a social engineering attempt to trick users into visiting a malicious site. No scripts were extracted, and the document body is heavily obfuscated.

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=astrological+calendar+2020+pdf
    • http://files.bearair.com/uploads/1/3/2/6/132695568/megesigusepojames.pdf
    • http://files.alexmorrisart.com/uploads/1/3/1/4/131453990/107362.pdf
    • http://filipaja.yourcrystalriver.com/uploads/1/3/1/4/131408970/c47f25939f4ffe9.pdf
    • https://cdn.shopify.com/s/files/1/0430/1147/3571/files/psychiatric_mental_health_nursing_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/fikavupetoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/23215131263.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4555/files/fejabakapefukoteb.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2404/files/the_glass_cage.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7477/files/23652377889.pdf
    • https://cdn.shopify.com/s/files/1/0434/5298/9607/files/83803426726.pdf
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/wubogokujatifofam.pdf
    • https://cdn.shopify.com/s/files/1/0432/1155/4980/files/paxugadelopavat.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_off00011654.bin
462fc4b1637ddf661000f8d1b7e5f37452ed0b45ffaa76816eab65bda34bd8ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 5584 bytes
font_01_sfnt_off00012965.bin
d3d0ef92ebc351b06a3c3b7d7254290fc86adacc0d88fb4b2fbd4eb4568380e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12965 15204 bytes
font_02_sfnt_off00015849.bin
5b013ab2a817094a01dfe16082dd3913e23fc5b32bc0a1efd26466507c90b548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15849 16400 bytes

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