Malicious PDF — malware analysis report

Static analysis result for SHA-256 f262225aa5708e92…

MALICIOUS

PDF

45.1 KB Created: 2020-08-23 16:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52a4c2b710ce4a676ab5502083b3ed6b SHA-1: c5fc2485f84807b9f4f3c02bf31c65d1d5fbab91 SHA-256: f262225aa5708e9227ea62e5d3ffb2ca6aa2019a6e9bcbeb0b56c268bbad6698
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating redirection to malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'classifying triangles answers' and references wkhtmltopdf, suggesting a lure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=practice+b+classifying+triangles+answers, which is likely used to redirect users to a malicious site. The presence of numerous PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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=practice+b+classifying+triangles+answers
    • http://files.eringipfordfreelance.com/uploads/1/3/0/8/130814397/7576839.pdf
    • http://bumojiril.sietinternational.org/uploads/1/3/0/7/130739456/xodexifez.pdf
    • http://files.spaceschool.ca/uploads/1/3/0/7/130739982/ginux.pdf
    • http://files.templeemanuellongbeach.com/uploads/1/3/0/7/130776081/doburetodijab-jorul-zebute-basizimiw.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/sezafakeged.pdf
    • https://cdn.shopify.com/s/files/1/0462/6887/4903/files/80528857832.pdf
    • https://cdn.shopify.com/s/files/1/0429/4692/0615/files/48686704063.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/vudekaji.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/bijenoforenukevutuzabuma.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9371/files/mejifobo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/begalisukoxolinen.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/bisod.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/nibenivugudatemirunove.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3767/files/john_deere_345_parts.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_off00006457.bin
574544b27a3e7bf7176178552dbbf7103cb1255e033d553c8af5db897559c9aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6457 5060 bytes
font_01_sfnt_off000075a2.bin
eabccf7b1bf6bf1e0fea78ee85e3881f3dcd9fbc6b58daa254fbd2ce74d1c5db
pdf-font-stream PDF embedded font (sfnt) at offset 0x75A2 10436 bytes
font_02_sfnt_off00009953.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9953 4324 bytes