Malicious PDF — malware analysis report

Static analysis result for SHA-256 448b8a23721c4b4f…

MALICIOUS

PDF

48.3 KB Created: 2020-08-29 03:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca62f987403acf7c728010da3e9c7db3 SHA-1: 3a85ff57f4058be547ea21547f1cfe9dc9b824fa SHA-256: 448b8a23721c4b4fe270eae0f78274fa009e763e2b5bea34e7789dc822340b8b
152 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL identified is `https://ttraff.ru/wix?keyword=fragged+empire+pdf`, which is likely used to direct users to further malicious content. The document body contains garbled text but also includes the same malicious URL, reinforcing its purpose. The presence of numerous external PDF links suggests an attempt to obscure the ultimate destination or to leverage SEO techniques for distribution.

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=fragged+empire+pdf
    • https://static.usrfiles.com/ugd/b8c837_94d470aa8a85454dba561d3bc5e01775.pdf
    • https://static.usrfiles.com/ugd/b8c837_490aa790dd5a4d7a8d9506a8d4864a6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_500ae9582963451ca9e8e81a37a2abc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_91bf990c28404a6b84c79293ed3236f0.pdf
    • https://cdn.shopify.com/s/files/1/0447/2376/5402/files/delegation_poker_karten.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/gesufume.pdf
    • https://static.usrfiles.com/ugd/b8c837_13a0100fd7514212b070df1b1c882c39.pdf
    • https://static.usrfiles.com/ugd/b8c837_612b728583104bd4b5a7bca3b874e8e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_97ea172f50e14b1f8697d727a5854c6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a108dee74664d858c4f742c367048a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6749ae73bce4fd8b2c312012ea23b8c.pdf
    • https://cdn.shopify.com/s/files/1/0438/6694/7744/files/guniwivabibaxakezutu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5189/1358/files/types_of_descriptive_text.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007331.bin
38b52b6ec391e3de06149fa064e5ec85e1beb71e1825fd65c6e64aeff7eb4617
pdf-font-stream PDF embedded font (sfnt) at offset 0x7331 4600 bytes
font_01_sfnt_off000082cb.bin
d71f186edb3e5955ad80688716e44f59f7369febbf1bffe8f483889dcc0d8bde
pdf-font-stream PDF embedded font (sfnt) at offset 0x82CB 10384 bytes
font_02_sfnt_off0000a648.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0xA648 4324 bytes