Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4c44b63c7c9dbf…

MALICIOUS

PDF

40.9 KB Created: 2020-08-10 11:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a494caa04a6ffdeea8941d7aec41761 SHA-1: 5947b307dca5b295be180712fc6a559a329b34db SHA-256: ac4c44b63c7c9dbfb608d8a2ca316a4deab82d1faae2a87f4016e142cb60fca2
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=printable+brain+teasers+pdf'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic to increase visibility. The embedded document body text, though partially corrupted, contains the phrase 'Printable brain teasers pdf' and the malicious redirector URL, reinforcing the lure.

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=printable+brain+teasers+pdf
    • http://vuruzi.lillianandlucija.com/uploads/1/3/2/3/132303382/rizixusevi_likigusipise_jubetutosibu.pdf
    • http://dorugokol.lindoncitydrill.com/uploads/1/3/1/3/131384401/wosasozanubi_mibewerixaga_vefokiz.pdf
    • http://files.davismadrigals.com/uploads/1/3/0/9/130969254/529779.pdf
    • http://files.acfields.com/uploads/1/3/1/4/131411199/bad8e1735b4c9.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/rewasuzibosoganumutonejor.pdf
    • https://cdn.shopify.com/s/files/1/0431/1053/1238/files/free_editable_budget_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/8084780266.pdf
    • https://cdn.shopify.com/s/files/1/0431/1144/8729/files/9051665124.pdf
    • https://cdn.shopify.com/s/files/1/0434/6567/0806/files/44500762479.pdf
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/62557970097.pdf
    • https://cdn.shopify.com/s/files/1/0447/8458/2813/files/edit_online_free_uk.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2102/files/tubetete.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/tinkers_construct_heavy.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38684703775.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_off00006356.bin
56b15f3659e59bb1f6b05471550960965ceaf2f3d6e992a3d33bc578886865d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6356 5176 bytes
font_01_sfnt_off000074f3.bin
a51d86b153210729b0e5828b9a1a2adf8c1f8052efa5eafe81f50077639eb748		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F3 10024 bytes

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