Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c477fa41209f80e…

MALICIOUS

PDF

67.3 KB Created: 2020-09-02 08:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b0e934fb74d5e611d0b7f364805fb6b SHA-1: 2c306de7c3b99f7092d021db159224dfc4934dd0 SHA-256: 8c477fa41209f80e44c5f92e89eaf3454a10827612a25f9e7ccb72429dc57c9f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF link farm'. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=advantages+of+information+technology+in+society', which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains the same URL, suggesting a lure to a potentially malicious site.

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/pify?keyword=advantages+of+information+technology+in+society
    • https://static.usrfiles.com/ugd/ac51ce_142898a20c264375a466e9b781f4e244.pdf
    • https://static.usrfiles.com/ugd/b8c837_30c2c394a7de43c1b808a586a801eb80.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c106e07f52c403bb00a9ab8189df849.pdf
    • https://static.usrfiles.com/ugd/26f730_c2a3af0fe3c44671a01952b257cdfd1c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2b96ae9efea49cda02753a74a29d5b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_efc3a2a58ac94b36bb8b3bdd4e5be681.pdf
    • https://static.usrfiles.com/ugd/f1780b_1129283f4b674d89a3b0522df9bb78d1.pdf
    • https://static.usrfiles.com/ugd/1f2646_be68a953a0b24fc485ed1382e737da06.pdf
    • https://static.usrfiles.com/ugd/e78b77_dce7252d2b23482b83ef805476a6ebd4.pdf
    • https://static.usrfiles.com/ugd/b3bc21_b044338a50984241b83cd7a8d9149a05.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_off0000c986.bin
200b90716885b70b6b0566c49536580bcdaf3e32dea3940518b633ba21df882b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 5588 bytes
font_01_sfnt_off0000dc73.bin
f15dae59f1437a89d35f1634379bea83b3794b54fd626e4be956237b615805d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 10520 bytes

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