Malicious PDF — malware analysis report

Static analysis result for SHA-256 c531f4c13f9ec5bc…

MALICIOUS

PDF

66.6 KB Created: 2020-11-13 23:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c97def3091ce690417d5b13468953f0 SHA-1: 8cf1e9486e821f6f6ca61cd9e02e54f1f3df0c51 SHA-256: c531f4c13f9ec5bc6fb9ba411179eb97f706944709336f3596e871686d7b4a1b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains text related to 'gas law answer key' and 'wkhtmltopdf', indicating a lure. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7773

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?utm_term=set+2+combined+gas+law+answer+key
    • https://ranuxibat.weebly.com/uploads/1/3/4/5/134595997/4001667.pdf
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f87169b4a0f4.pdf
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f8bf524be7e1.pdf
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/narul-gelurixapejiwo.pdf
    • https://niladituzisum.weebly.com/uploads/1/3/4/7/134736231/pafemebofogazefen.pdf
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/3261314.pdf
    • https://cdn-cms.f-static.net/uploads/4367300/normal_5f975f1869d13.pdf
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/5e71ab85.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/78bb2b3a-2212-4d7b-b242-f34fb4bb497c/dotetokeru.pdf
    • https://uploads.strikinglycdn.com/files/664712fa-dc44-40f6-b628-a54717f332c7/ap_human_geography_massively_gigantic_review_packet_answers.pdf
    • https://uploads.strikinglycdn.com/files/1594ea3d-1d16-45d9-a896-b3a78a02bb82/bloons_td_5_hack_download_for_pc.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d936.bin
b1db0c9b5023232d79212261ea71b97d6b4a48426a8d6f0eb2eec13c169375a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 5892 bytes

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