Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7da48a65be2b04…

MALICIOUS

PDF

35.1 KB Created: 2020-08-29 15:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13326b7a824f019f5235581676f42aee SHA-1: ab9cd05ac250f1a7e6b251a9406f9c3a01666786 SHA-256: 9a7da48a65be2b04b2bf7eacaf4fb7959cdad3770976b5edffd897e91288545c
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or corrupted, but the presence of the malicious URL and the link farm heuristic suggest a phishing or malware distribution attempt.

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.com/wix?keyword=sigils+of+power+and+transformation+a
    • https://static.usrfiles.com/ugd/b8c837_86e99511f69c406393a8b64b56dfe739.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b78e6b3ed3c47ee8586b7142fe6f0b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ffe9087145e401890dc299fa14de368.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cb0cda1480f47419fa40babc8d9a77b.pdf
    • https://static.usrfiles.com/ugd/b8c837_854c2fd46a664c888cd916e048a33000.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f1b2fc291d84aa599e22554a97cf840.pdf
    • https://cdn.shopify.com/s/files/1/0435/5650/3707/files/the_middleboro_casebook.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/85316070103.pdf
    • https://cdn.shopify.com/s/files/1/0432/1918/9915/files/13836069963.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/52433356038.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/55746173070.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/28026160900.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_off00004b7e.bin
3b8952435aa577fb89610a962e2f1b06045835bd88a0a40f581a8768a749c75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B7E 5556 bytes
font_01_sfnt_off00005e56.bin
a8d9d7e91fe0b96578441c0ed582211fda1aa7bb0b8ae2ab66ecaa41896c42f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E56 9716 bytes

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