Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c6073bbe3e713b…

MALICIOUS

PDF

46.1 KB Created: 2020-08-31 12:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f52082c77ddb14df048aa6a25c943b35 SHA-1: bb94a463503488dfd0e79e5a411cd6a1e3435e52 SHA-256: 94c6073bbe3e713b0f84474585a922f0f2f42ba939fb4aed6337e742ad840e81
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a redirector URL that appears to be part of an SEO spam or phishing campaign. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier also flagged the document as malicious. The document body, though heavily obfuscated, contains the same redirector URL and references to a CPU review, suggesting a lure to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.me/wix?keyword=i7+6700t+review
    • https://static.usrfiles.com/ugd/b8c837_9ebb990a82c140de998cf1f85cacf811.pdf
    • https://static.usrfiles.com/ugd/3ce946_47495b215e0e4b16bc9a68e7317db6db.pdf
    • https://static.usrfiles.com/ugd/aff7ca_638fcb019f3d4e7e8df0804c69bf8ea5.pdf
    • https://static.usrfiles.com/ugd/b8c837_de9313b406d64784937543534630954f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0db1f00b79c2431a8e8f83ebf3afcfaa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4978/files/chevy_305_crate_engines.pdf
    • https://cdn.shopify.com/s/files/1/0434/6655/5556/files/simiriruk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0426/files/3rd_eye_meditation.pdf
    • https://static.usrfiles.com/ugd/ec0c41_33632e1195844e6f9ae7392b33f260e4.pdf
    • https://static.usrfiles.com/ugd/64d889_e09231ccb789464d8caf8b5b21e4c913.pdf
    • https://static.usrfiles.com/ugd/3aca14_1a73bcc22ff942aeb500cfff565ca536.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_off00007669.bin
f500ccf40300d4b255f23cd6da410ae27578ef433b56783252ecc4a10288dffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7669 4724 bytes
font_01_sfnt_off000086a3.bin
b021af0db1a33c6abbee4e7384f3e09707a17d9f4ab696aea5c1266f7baed4c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A3 11004 bytes

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