Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f778f8fa83580a…

MALICIOUS

PDF

33.5 KB Created: 2020-09-08 22:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35838964cb483f10e9e8c47ba0cb2234 SHA-1: 53c2cbd7282a1bb11808ed1c2606105982f487e7 SHA-256: c9f778f8fa83580abfa0e6968342717d338a0a2275c50b0cd4e8b9a4b05ec17b
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs. This suggests a phishing or malware delivery attempt, leveraging a seemingly academic topic to entice clicks.

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=gay+lussac+and+combined+gas+law+worksheet
    • https://static.usrfiles.com/ugd/67f5f7_6429211f4557490faf93fed1d5224a7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5eccc9b80a5459c9e43c2885ebfc1c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_5941800d48d84f419c6aca8870b62f18.pdf
    • https://static.usrfiles.com/ugd/bd5c68_9919be22607140a78073b41acc6014b9.pdf
    • https://static.usrfiles.com/ugd/ef7b09_38c34e2453e5400bb859dbc048851fa7.pdf
    • https://static.usrfiles.com/ugd/e56fe2_a183c46c4d73443cab58877b9adeb5b1.pdf
    • https://static.usrfiles.com/ugd/ac72e0_52988054ffbd4297ab7efa08854b1a2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f165b50ab104c9c8197b1a3a659bd3d.pdf
    • https://static.usrfiles.com/ugd/3c9ac1_4fe00b989968433885c0a9a05ce7acc0.pdf
    • https://static.usrfiles.com/ugd/cc1a03_73f29d98e61a4c0db4b269c8a0f11c86.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_off000043e5.bin
3c4a006b6c84074c7aaf79a5ac82f675ac3b1c4ecc4d9e675168acf28dcfdbdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43E5 5780 bytes
font_01_sfnt_off0000577b.bin
1061c56aeb787d5bc93e8811f74b5b065a94396b76fc0f381e4c04a6a6eaf9e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x577B 10068 bytes

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