Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27a5e4a6653c878…

MALICIOUS

PDF

39.3 KB Created: 2020-08-30 05:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e643effa5e9ea74784226e0280fc25f SHA-1: 6442b0e2d7a2cb5accbb75eca98293cd3643eb9d SHA-256: a27a5e4a6653c878a9cae1512f3d0b360e3898bf376b3f0d2dac53f4da2f49a8
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to manipulate search engine results and lure unsuspecting users. The primary malicious URL identified is ttraff.ru.

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=monopoly+spielanleitung+pdf
    • https://static.usrfiles.com/ugd/74c34a_f28a1d7c7e8e42638847379d6aaf9b24.pdf
    • https://static.usrfiles.com/ugd/3f80ec_8741f2692a2f41d8a2fe75ac4ee2b1bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_69a0d0697bae4e819ea50a7c82bbd771.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab8a193a91754acbb0c8fd1c8943f0f8.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3471/files/destination_b2_vk.pdf
    • https://cdn.shopify.com/s/files/1/0433/6739/9575/files/2018-_19_school_calendar_template_google.pdf
    • https://cdn.shopify.com/s/files/1/0430/0662/3903/files/basics_of_computer_software.pdf
    • https://static.usrfiles.com/ugd/585b1d_8681a107664a4124b5919a9cda14c9cf.pdf
    • https://static.usrfiles.com/ugd/dba42a_619a03b3da9e43ebbf2971bc84b83bcd.pdf
    • https://static.usrfiles.com/ugd/d94ae5_c962b5d79fa149e2a6a2a9a36042c3dd.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_off00005b7f.bin
01f69cd60052f4c95b522c00f9445e077df3a308202c298d1c517765e27ba6f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7F 5220 bytes
font_01_sfnt_off00006d6a.bin
e4deb50f66f434c62b3e2c517048333abab405a9c30d975d482ca870bb11d86c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6A 10420 bytes

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