Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4587e918198d7cb…

MALICIOUS

PDF

44.0 KB Created: 2020-08-30 07:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6adac1fe7a46ebeb5d0ceda133fbfce6 SHA-1: c22a92009636eed6137e06c07185fa69f66fa0e6 SHA-256: f4587e918198d7cb0e19d19a37ca8fdc73864d4d9c036bf3ce2fe5f960f4f98d
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting seemingly benign PDF files. However, one critical link directs to a known malicious redirector at ttraff.com. This suggests a link farm or SEO poisoning tactic designed to lure unsuspecting users to malicious infrastructure. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, further obscuring its true intent.

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.com/wix?keyword=cluster+sampling+vs+stratified+sampling+pdf
    • https://cdn.shopify.com/s/files/1/0435/2642/2687/files/fagigelezeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/lizuvaxaxagobazos.pdf
    • https://cdn.shopify.com/s/files/1/0461/8584/0803/files/osrs_f2p_pure_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3850/files/amcat_mock_test_papers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/26360596466.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/cv_template_free_with_photo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2187/6900/files/xidum.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/nepotarebog.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6471/files/1237729245.pdf
    • https://cdn.shopify.com/s/files/1/0433/7532/9443/files/22556005172.pdf
    • https://static.usrfiles.com/ugd/a44510_3ec5d20e74794789bae2221df077e782.pdf
    • https://static.usrfiles.com/ugd/824332_42d9df28d3d04a8c840b6307b129cff9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ff0.bin
b4a8954d4fbb605bec6bf06b2599e5ba3571a460106dd0547bb96f58f3122e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF0 5216 bytes
font_01_sfnt_off00007198.bin
86354b3b398c146179d139f033160c16f7cb0df65d4cb9207a48be8d78eb1178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7198 10376 bytes
font_02_sfnt_off000094f2.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94F2 4324 bytes

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