Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8fdcec7a6842d0…

MALICIOUS

PDF

39.4 KB Created: 2020-09-06 11:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34813d621b80b9779fe402954a4368c1 SHA-1: d05743faf27ac1faf34e4a7b74151e249ba51534 SHA-256: bd8fdcec7a6842d06f05880635d12d805dec4e46c9c8cb469cce8ebb83c1df29
140 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. While the document body is heavily obfuscated, the presence of numerous links, including the malicious one, suggests a phishing or redirection attempt. The heuristic 'SE_QR_LURE' also indicates a potential social engineering tactic, though it's less definitive on its own.

Heuristics 4

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=super+teacher+worksheets+division+word+problems
    • https://static.usrfiles.com/ugd/b65acf_cc39d48922024ce78650a7b3d986d5f6.pdf
    • https://static.usrfiles.com/ugd/822ecd_c0c36e120a9b470c9613aa1d4c867657.pdf
    • https://static.usrfiles.com/ugd/017c44_66c3f3c048e34c4eb4a4f3ee2afb0209.pdf
    • https://static.usrfiles.com/ugd/6a22cb_2aa0e835c8a64770be39970d410133d3.pdf
    • https://static.usrfiles.com/ugd/f51585_17be0e0e12aa49e1ad45b1ff3f34d480.pdf
    • https://static.usrfiles.com/ugd/aaaf79_aa363086516f4fcd8122aa0ffddea069.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/desumubepuve.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/5828723235.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/zukatulibasetonugaji.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7098/files/91705646702.pdf
    • https://cdn.shopify.com/s/files/1/0459/6760/5927/files/vujumabumajo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3329/6028/files/curriculum_development_book_by_purita_bilbao.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_off00005857.bin
099483cd4ae41253761470a859cb3a05f88f5dfb20e69241de7b862a2be69433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5857 5772 bytes
font_01_sfnt_off00006be5.bin
ea7b481c0410c911c10d5cda96eb2af2234b6bc7feadee844a86e83f3931d2c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE5 10844 bytes

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