Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1ca7749b38c236…

MALICIOUS

PDF

37.3 KB Created: 2020-08-02 12:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ef6e0938abd663e93313c8440985a9a SHA-1: 98c541dfb40816affb57c0fc5a9c4d1aa419aeac SHA-256: 5a1ca7749b38c236e7ecd7b4dfb0d428f7b81f8321fec6ccb4eca9293b2fb530
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector infrastructure at ttraff.cc. The document body, though partially corrupted, contains text related to 'Dean Martin let it snow' and references to wkhtmltopdf, suggesting a lure to disguise the malicious links. The primary attack pattern involves redirecting the user to malicious content via these embedded links.

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=dean+martin+let+it+snow
    • http://files.joegrabowski.com/uploads/1/3/1/3/131398008/213d1701.pdf
    • http://files.lightenlifewellness.com/uploads/1/3/1/3/131379183/6184693.pdf
    • http://files.fastelectricalrepair.com/uploads/1/3/1/3/131382955/wuzekagewa-kazedinomedob-nogabipiwowaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/powifevezilolixepog.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/42654249471.pdf
    • https://cdn.shopify.com/s/files/1/0432/2109/0471/files/17901862897.pdf
    • https://cdn.shopify.com/s/files/1/0437/9380/9557/files/27587288551.pdf
    • https://cdn.shopify.com/s/files/1/0434/1684/6488/files/6838802905.pdf
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/24817491815.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/36971423372.pdf
    • https://cdn.shopify.com/s/files/1/0437/4796/7130/files/koxozimibusafurakawumenam.pdf
    • https://cdn.shopify.com/s/files/1/0437/3279/5541/files/lynyrd_skynyrd_curtis_lowe.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/enable_location_services.pdf
    • https://cdn.shopify.com/s/files/1/0436/3311/5289/files/zazeriguvufe.pdf
    • https://cdn.shopify.com/s/files/1/0438/3673/5645/files/nagivaxorazezasaxig.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_off000055f5.bin
16a783bc77d7bc775f93988d366205c983630c468508900e3eb4889aeda8d6a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55F5 4924 bytes
font_01_sfnt_off000066ae.bin
9d9d9ffd89844187baa6f28af79599a72ac55ed2f8d2531b9864cfc0f2dc4d98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AE 9880 bytes

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