Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4bcfe372fd93bd3…

MALICIOUS

PDF

41.9 KB Created: 2020-08-17 16:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bb52975073b1366b9f9d2a7c0dfa89d SHA-1: 5e176ef2691913063388db1e51a8d84b92d9dd63 SHA-256: b4bcfe372fd93bd3317608e412c3dc98bcc331b0d6a25e8f1d0f1b02985c3a98
120 Risk Score

Malware Insights

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

The PDF was generated by wkhtmltopdf and contains a significant number of embedded links to external PDF files, many hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=keloid+formation+helix+piercing', is flagged as a malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly benign documents.

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=keloid+formation+helix+piercing
    • http://vimikog.college-elf.com/uploads/1/3/1/4/131406676/7459252.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0047/files/gone_elevation_worship_chords.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/32705627487.pdf
    • https://cdn.shopify.com/s/files/1/0429/8607/8369/files/suliloboguvijuxa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/bovabed.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7381/files/modern_trends_in_educational_management.pdf
    • https://cdn.shopify.com/s/files/1/0434/0075/7398/files/dc_motor_armature_reaction.pdf
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/33763611218.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/pink_floyd_moonhead.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3555/files/95251762334.pdf
    • https://cdn.shopify.com/s/files/1/0434/0600/0282/files/roadside_design_guide_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98048873934.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/6536102644.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/bezoletudaxofurodikaku.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_off000066ac.bin
abfcf104c77a0d57cfe4deccfdce0e10e6c5172c79e9895bffdae5eaeb7ccddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AC 5428 bytes
font_01_sfnt_off000078f5.bin
1a35011892d8fb6a69a0469164681ba2ec389099b802215bc985689290550b6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F5 10036 bytes

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