Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0c479f47eb702e…

MALICIOUS

PDF

45.0 KB Created: 2020-08-31 21:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6095d4c484630ff88c5242038259a15 SHA-1: dcd0991964ecfa416d2a9effce994ee3427abd3c SHA-256: fd0c479f47eb702ea7f7fa004128ab6366446d577aa1dcc9a6a3e201c4edd030
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URL points to a redirector service, suggesting a phishing or scam attempt. While the document body is heavily obfuscated, the presence of the URL and the heuristic findings are sufficient to assess the attack pattern.

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.ru/wix?keyword=marginal+costing+statement+format
    • https://cdn.shopify.com/s/files/1/0452/8082/1410/files/pukevona.pdf
    • https://cdn.shopify.com/s/files/1/0437/6897/1415/files/ovpn_configuration_file.pdf
    • https://cdn.shopify.com/s/files/1/0429/1044/9830/files/gaxarub.pdf
    • https://cdn.shopify.com/s/files/1/0432/6155/8944/files/xesomitusugoxumix.pdf
    • https://cdn.shopify.com/s/files/1/0431/4873/8720/files/50132304613.pdf
    • https://static.usrfiles.com/ugd/eb4c03_02b0aa60bbfd40eaa5285f2871f5d5d4.pdf
    • https://static.usrfiles.com/ugd/f3cb45_e041f59981314267af7464dab7483d93.pdf
    • https://static.usrfiles.com/ugd/fa6f14_67e3ff3b4c534d6c94f720f8bc738eab.pdf
    • https://static.usrfiles.com/ugd/e73fea_7956dc0ea76c4ee2a0fdd681585cd69a.pdf
    • https://static.usrfiles.com/ugd/b27199_4cbca50dce1e471c84ef28cf4f1fb8b9.pdf
    • https://static.usrfiles.com/ugd/98857b_90a8635aea3046078d0de790e13de9f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_13cff52808c341408d9d2ff4f2ff97d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_32f6563762d24f5e9b8764a9afd3a3ee.pdf
    • https://static.usrfiles.com/ugd/2ca22b_6293dd2760704d4e99949be34f21f855.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c5e88d230c347a6a819567be00ac3b9.pdf
    • https://static.usrfiles.com/ugd/a58b01_b04e0ff2c0fe4255a8ae660cb16c050a.pdf
    • https://static.usrfiles.com/ugd/2074c9_1a8ded89f81d456ea3f5350486ef8147.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/
    • https://static.usrfiles.com/ugd/f3cb45_e04

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000716d.bin
90bb54c4bb6a59b5a665350bc8f50666e7ec75c704f10157666145dc5ea8f893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716D 5208 bytes
font_01_sfnt_off0000831b.bin
191d0df128029db24bbb2e585554f8c060f6b860ab3b865f8dcbc1f713ee0834		 pdf-font-stream PDF embedded font (sfnt) at offset 0x831B 10492 bytes

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