Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fddc91c33857ce…

MALICIOUS

PDF

38.4 KB Created: 2020-08-31 06:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afd6e90ad2f3cde9e89183616159c75a SHA-1: 319a5708b7b434eb15d2baa6fe0a7a9d2315fb7e SHA-256: c7fddc91c33857ce8dd370c8dd6a637dfa742ac3426b8d8310b3f19633a5bda4
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a link farm, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text suggesting it is a 'parts diagram' and includes the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing the user to a malicious URL via a deceptive document.

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=n40t61-343+parts+diagram
    • https://cdn.shopify.com/s/files/1/0431/0679/5686/files/bukosuwuramorevex.pdf
    • https://cdn.shopify.com/s/files/1/0427/7826/3718/files/kevoreronigi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/robafuvebatatawadodoxe.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a5556bc64c6445db763bc5047ee6aeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_80b8a4e5090542099a0308f65006ce3b.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_aec250eb07824c0599152db63e835f3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e97d1b49d85246f88f14ebaee3a5159f.pdf
    • https://static.usrfiles.com/ugd/b8c837_250c8889548e4b2fb66aed7fd1bd1af5.pdf
    • https://static.usrfiles.com/ugd/b8c837_6eb543a0a3fe47a0903e4561e1c80e64.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_9f56041d99c64394b9345d6f0dacc369.pdf
    • https://static.usrfiles.com/ugd/47b1e8_a09891ff3366457886a227efaf5e9df7.pdf
    • https://static.usrfiles.com/ugd/cc14e4_adf3bcc0c26546a3b3774773a0ad7937.pdf
    • https://static.usrfiles.com/ugd/299074_48f8213563ce4217ac8a36d0348d3c53.pdf
    • https://static.usrfiles.com/ugd/4d6844_ef63e9751fb647d3943f3458cd05d89c.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_off000050b7.bin
845c6a22dcddb341063c38e8c9e4929b1119bdd71fe9e6e4145f6e48b3a1739f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50B7 5848 bytes
font_01_sfnt_off0000648e.bin
bbc126761640c94c7b8db148907650e7778a46b5eca3ad24bbab80ef8e1594d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648E 12412 bytes

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