Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d28086457a234fd…

MALICIOUS

PDF

35.8 KB Created: 2020-08-30 05:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dd8fb66f8f41ef621c881c3761e516f SHA-1: 8c0994cdc2b14f0a5c947b508da3ca6f291c8bf9 SHA-256: 9d28086457a234fdb0d3d5b8a1b61cb016bc856ce56a41235b6f6499b8d63034
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its extensive use of external links, characteristic of a link farm. One prominent URL, 'https://ttraff.ru/wix?keyword=the+family+philip+cohen', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on 'static.usrfiles.com', suggesting a coordinated effort to distribute malicious content or conduct phishing attacks.

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+family+philip+cohen
    • https://static.usrfiles.com/ugd/4f270c_ee889efbdd664093af10d806970a6ae6.pdf
    • https://static.usrfiles.com/ugd/b7082a_24f452a5d23b486885b5a0989e1a35c1.pdf
    • https://static.usrfiles.com/ugd/067ecb_1b986700c9e74453af7593592132a2a4.pdf
    • https://static.usrfiles.com/ugd/97493d_48a2935de2174f5f9adf6dce438d35f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e91c8ffad224240b9b6ae6b2fc36491.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f35e69666394c26ba122993f94d4a6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d234fa13782490a972134cec80fb211.pdf
    • https://static.usrfiles.com/ugd/5926b4_3493347587b94d988155cc73913a954e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a9bb2e478b94351bfe9df9a0d1e2d59.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bd7681ab6534374b477d4aa1fe4b1fe.pdf
    • https://static.usrfiles.com/ugd/6846fe_3cbd39ffdeb4450392db6f0466106f0f.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_off00004d44.bin
318863fa24ee85f839f83d31df34c3587000c8e35e5c5a3421516611e6f3240b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D44 5032 bytes
font_01_sfnt_off00005e53.bin
ad0f53777d5bc5dbf380de3d861aaef23f5496e6c57bec981c417053faab2c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E53 10728 bytes

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