Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf292a754e1e5a3…

MALICIOUS

PDF

66.9 KB Created: 2020-08-30 18:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0868c9518c7a1f144f7e0a833cf2f496 SHA-1: b24786320100cb293434e81ea69e690d5291fc71 SHA-256: 2bf292a754e1e5a3ff63fda11484f9c08f654c6d0677624e12604b3443471cc1
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised with a book title. The PDF also contains a large number of external links, many of which point to a domain hosting PDF files, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness.

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=the+house+on+mango+street+book+online
    • https://static.usrfiles.com/ugd/eed56f_60de8a12d986418e84068af0610e192c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b67014d539ea4db3bcd7b30ca35ce6ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_2add61c2764c44468a3083442cb4b740.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_c18d1340fb054d1a9a12586c11ca0064.pdf
    • https://static.usrfiles.com/ugd/b8c837_7df349b8dad545d58ed9b50e11a55cc5.pdf
    • https://static.usrfiles.com/ugd/217d68_3f2286b336e8497ea3debadf564b8dd9.pdf
    • https://static.usrfiles.com/ugd/30e015_0e95d0437bc34d288bf0280378cd979f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f700c32a767414ebb4a7393d893bb16.pdf
    • https://static.usrfiles.com/ugd/c0b427_836084a6248f43d1abbbda610a5dbed5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae06218149b2448b9d8164d7cf604aa0.pdf
    • https://static.usrfiles.com/ugd/a2e20a_7d45226996534fb195c1fedf0f544659.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/0c8cc8_c18d1340fb054d1a9a12586c11ca0

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c961.bin
519b96bbd53659cfdf4ff669fb4e7a2f5965d594e9f0f60ef97e6e662876b3f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 5252 bytes
font_01_sfnt_off0000db0c.bin
a455c6bbd559dc0c985260eed3824fd351edb013366fc4c10f1dc7e661112640		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 10452 bytes

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