Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e41471c3a5e78c…

MALICIOUS

PDF

40.7 KB Created: 2020-08-31 14:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b35aa99b4afb2617074f7806ea88c231 SHA-1: 70eb9b0e4b770ad5f11b7e9afb3359804a47137f SHA-256: b9e41471c3a5e78c5bc29c95d009b1c17e2024bbae5115a4ebcd6338b5e6ba3b
150 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, masquerading as a free Windows 10 update. This is further supported by heuristics indicating a malicious redirector and a link farm, suggesting a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded link is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wix?keyword=update+windows+7+to+10+free
    • https://cdn.shopify.com/s/files/1/0429/2640/7843/files/98217767675.pdf
    • https://cdn.shopify.com/s/files/1/0429/7352/8213/files/rapojalewomokofinilope.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3462/files/40377853032.pdf
    • https://cdn.shopify.com/s/files/1/0438/3444/1890/files/43991566057.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2854/files/10938756446.pdf
    • https://static.usrfiles.com/ugd/b8c837_14cb80bdcb40485c9783e7d101722bf0.pdf
    • https://static.usrfiles.com/ugd/73c254_8314b5aedf3747968e7757ee5fc3de3a.pdf
    • https://static.usrfiles.com/ugd/44b221_4351058298a8414c83c7537e0cce5be3.pdf
    • https://static.usrfiles.com/ugd/9cb927_48e606d47a7a4b4994e5ac005d1e2a11.pdf
    • https://static.usrfiles.com/ugd/1f6d71_c2a9c355293f4ea4b35c1224936b8304.pdf
    • https://static.usrfiles.com/ugd/edb4a7_79ed8c7b18354b5995d8d5b5b1f9be81.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_fef6abb01bb6449f9452a19d6dae0a93.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cc8506eb33d413a80025dac45783ca4.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_b527625c351e4fe79857c569414d333d.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbb400a36ca84a078d6a91bcc7b9d5d6.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_off0000620e.bin
367fe416a7fca7452a211824c490a6ab5da976791165f4ba6bc60bdfdbbbb52a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620E 5360 bytes
font_01_sfnt_off0000747a.bin
de3088d20755d5d1bd928b80af8adbddda307cf579d4133666f123711de4dcfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x747A 9844 bytes

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