Malicious PDF — malware analysis report

Static analysis result for SHA-256 540bcd74f45ea6d3…

MALICIOUS

PDF

36.2 KB Created: 2020-08-14 18:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1f291bcb02654e0da76b2dc611b17ae SHA-1: 30f8941c8a6a6ebd4f522e7ab1a97be4476c8b8e SHA-256: 540bcd74f45ea6d39bfadff918bbb226e8b76983a4207f6344134f88a132ae7c
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=aqa+gcse+biology+textbook. The document body, though heavily obfuscated, also contains this URL and other Shopify-hosted PDF links, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=aqa+gcse+biology+textbook
    • http://files.tdpbooks.com/uploads/1/3/0/8/130814715/72ed8d6.pdf
    • http://files.shawncorneliusentertainment.com/uploads/1/3/2/7/132740804/189cb.pdf
    • http://files.dogbreedgifts.studio/uploads/1/3/2/7/132710491/86da115a.pdf
    • http://vafeke.tonyzale.org/uploads/1/3/1/6/131606490/derapenupo-vamuk-kudijofoxowumup.pdf
    • http://files.thecastlespa.co.uk/uploads/1/3/1/4/131407802/bositoliluw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/rune_factory_3_rom.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/ulg_hdlg_dhi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdf
    • https://cdn.shopify.com/s/files/1/0436/4615/6960/files/tozivodipunogikuxadi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0093/files/brachial_plexus_lesions.pdf
    • https://cdn.shopify.com/s/files/1/0432/4950/0328/files/kazifizijodixofoduvedu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/65138748943.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5351/files/pixobujaragudavozaroviko.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/82824755297.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/bekube.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_off000049de.bin
373bc8987f145282fd5149db194bcf3958d8f97564973d9735a21504c13d6e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49DE 5360 bytes
font_01_sfnt_off00005c32.bin
ac773a7abc43a31ca1582e811892b918ba2790d9f78a1502d754c94d69881cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C32 12548 bytes

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