Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcbf60530d75be0…

MALICIOUS

PDF

46.7 KB Created: 2020-08-29 11:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7ad3b48c3ed224bc5a4fceed11f87ba SHA-1: 65ef6472f2f146c953f6445da318b309d405cd82 SHA-256: 6dcbf60530d75be0beb72b0a28e9a09e70eda01a02c9c0d3781ab41b1e555b43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the one identified by the heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious sites via link farms.

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=modelo+de+programas+ejemplo
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_cfa4bfd4d8014aec97212927136faeb3.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d2de1530d9a40f7a8d9d9c9c6652491.pdf
    • https://static.usrfiles.com/ugd/b8c837_241b7401b0894806bcb139ab019b1ac7.pdf
    • https://static.usrfiles.com/ugd/b8c837_598d6818cebb42b9a47e2967aa1b1525.pdf
    • https://static.usrfiles.com/ugd/b8c837_62739d95b2f248fca9c21bdb07cb5f2f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a50513b71d841099b13879ecfc9f6ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7c1df167c7144dcb2e091af2a92c45b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9f50d2292234b079bdbdb4c590e9213.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ae48edabf42431f82e015024c6b0086.pdf
    • https://static.usrfiles.com/ugd/b8c837_ccbb1ebdcb92465c8c27d17a6d91a253.pdf
    • https://static.usrfiles.com/ugd/b8c837_3eecc460d65b40b39c20558ba37dc838.pdf
    • https://static.usrfiles.com/ugd/b8c837_27e7badc137c433c9697aaf95c72375f.pdf
    • https://static.usrfiles.com/ugd/b8c837_592fc771a663426b9c3c827c3e006149.pdf
    • https://static.usrfiles.com/ugd/b8c837_278e3a57eae84c0eab8999e0be6f1c5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_282144d27d114da48b8ec9f09c875d99.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006969.bin
ca431f5024b88bf9b706b033a9517d9da052b378fe17da25a0ea4e607a8eb032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6969 4916 bytes
font_01_sfnt_off00007a29.bin
cd01e171db8158023e68706ad6226148454b41b18ba7b5ac848fb8e1318cf879		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A29 11108 bytes
font_02_sfnt_off00009e2f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E2F 4324 bytes

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