Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c71f5c53a32a04…

MALICIOUS

PDF

40.3 KB Created: 2020-08-21 03:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e6a3b29e2394184d659b83e75e1275e SHA-1: 345d7fecc9b500538a1e2e524625ba3b4b0d6a8c SHA-256: e6c71f5c53a32a04e6c1367c1c3e7a024ad8cade32aea7765c7673714900355a
188 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com', disguised as an NHS appointment letter. Additional heuristics indicate a password-protected archive lure and a callback phishing lure, suggesting a multi-stage attack. The document body, though partially corrupted, contains the malicious URL and references to NHS appointment letters, reinforcing the phishing pretext. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm used for SEO poisoning or distributing malicious content.

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/pify?keyword=nhs+appointment+letter+pdf
    • http://didurujaw.7thbattalion13thartillery.com/uploads/1/3/0/9/130969472/4932661.pdf
    • http://files.yewmountain.org/uploads/1/3/1/4/131453136/6337845.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4980/files/brother_hl-_2280dw_driver.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/ruzamaxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7670/4669/files/asian_paints_colour_book_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/23621636292.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1237/files/54422204232.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/44690171622.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0803/files/47693353300.pdf
    • https://cdn.shopify.com/s/files/1/0429/6507/4086/files/86897185429.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4831/files/tv_schedule_des_moines_iowa.pdf
    • https://cdn.shopify.com/s/files/1/0435/8235/7663/files/veruwakudavivug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9232/9116/files/81954023414.pdf
    • https://cdn.shopify.com/s/files/1/0438/2212/1122/files/dimuteloxobobonujawexekas.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_off00005fc9.bin
f9aca0064d5e68db64a4712e775cb29ecf30cce57e44c8e59ee22398a354c497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC9 5248 bytes
font_01_sfnt_off0000716c.bin
f4efbd2e646864fd81165bf816c2e0bf839681ffa41a97027f59a949b8349843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716C 10352 bytes

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