Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb4d8a2a2d1f8c3…

MALICIOUS

PDF

42.7 KB Created: 2020-08-10 19:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0e37bc91712a535f858b318da8b3cec SHA-1: 59ba86fe9229803c3366d3f8dbe03d33abb0e4ca SHA-256: 3fb4d8a2a2d1f8c3c2360173f6a1217e280d3d0a29c6c47271eb4d284d9bd15e
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to a URL designed to lure users. The document body, though heavily obfuscated, contains the same malicious URL and numerous other URLs, many of which are hosted on potentially suspicious domains. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content broadly. No scripts were extracted from this sample.

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.cc/pify?keyword=heart+rate+variability+in+athletes+pdf
    • http://batibu.catmeyers.com/uploads/1/3/1/1/131163599/4a7693d8d5dfeec.pdf
    • http://files.whatsupwellness.com/uploads/1/3/1/4/131409090/reteviwawukat.pdf
    • http://files.ihellary.com/uploads/1/3/0/7/130740490/vinijekuxidoje-lekifoxom.pdf
    • http://files.niagarasuicidepreventioncoalition.com/uploads/1/3/1/4/131405977/fuwem_kujajos.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/pedrotti_optics_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/96845283622.pdf
    • https://cdn.shopify.com/s/files/1/0432/9239/3640/files/zekizafevodil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/labun.pdf
    • https://cdn.shopify.com/s/files/1/0434/4872/9766/files/assassin_s_creed_black_flag_trainer.pdf
    • https://cdn.shopify.com/s/files/1/0430/4224/2709/files/39116669842.pdf
    • https://cdn.shopify.com/s/files/1/0438/2759/3376/files/ar_55_46.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/22224813736.pdf
    • https://cdn.shopify.com/s/files/1/0428/1414/4675/files/fipiwedefetobomad.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/8254381066.pdf
    • https://cdn.shopify.com/s/files/1/0428/3983/4791/files/medicinal_chemistry_by_ashutosh_kar.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_off0000676d.bin
22072274a0c6e4943ea7040b0bd6d48d77b35c66b4d362bd8b03cd58cf5a86e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676D 5392 bytes
font_01_sfnt_off000079b5.bin
95ccafc3bf3253ac4ef608d241fdcbbab5168fec055c7efb18b6da38941e168b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B5 10676 bytes

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