Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbe1277bb9ba9e2…

MALICIOUS

PDF

44.8 KB Created: 2020-08-31 20:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 369d171e7a33abdafa7240c73faca461 SHA-1: e21bcca3dbdca5cd77f50ba7d9f646bda61fdcf3 SHA-256: bfbe1277bb9ba9e2986e89d3286807f131fc25a01c2c3ec220be5e8fa8e258a1
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.com' with a keyword suggesting a hack or cheat for Android games, indicating a social engineering lure. The PDF also hosts a large number of external PDF links, many pointing to 'static.usrfiles.com', suggesting a link farm or redirection infrastructure. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports the malicious intent.

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=total+conquest+hack+android+online
    • https://static.usrfiles.com/ugd/739437_edc752c7259e429597aa16b9f21ec946.pdf
    • https://static.usrfiles.com/ugd/be19e1_cc64f1058b8147aca355cfaebd418235.pdf
    • https://static.usrfiles.com/ugd/726ec9_44d11d93b0be40b1abe9ffb2ad2e22ac.pdf
    • https://static.usrfiles.com/ugd/6290de_2807cbbfef504f2b952938e49ee4113f.pdf
    • https://static.usrfiles.com/ugd/f0e51d_fec1a7c020ee424b8a5e7645f4e1643d.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/vumurirewokis.pdf
    • https://cdn.shopify.com/s/files/1/0435/9825/0141/files/voiced_and_voiceless_th_words.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2067/files/61652768090.pdf
    • https://static.usrfiles.com/ugd/0047a4_0a55c66e87454ea0bf10b766f8499390.pdf
    • https://static.usrfiles.com/ugd/529dbf_7b4cbbb55cb146abaad1803cedcf40c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8db80fde86a496da0cd0628d5415365.pdf
    • https://static.usrfiles.com/ugd/469aea_ed89cb7d53ab4f1b956f33411de4369e.pdf
    • https://static.usrfiles.com/ugd/ac72e0_90fbf0c00c8249c3a35b4a694d4fdfa4.pdf
    • https://static.usrfiles.com/ugd/cb2bed_c68f329411504c70a8a0fd4b9d153e20.pdf
    • https://static.usrfiles.com/ugd/20d83a_9ac8ef5a536a4a1a81e6d4bd49769037.pdf
    • https://static.usrfiles.com/ugd/defcb2_0ff46a3e97fd487b9d00b1fc171ce7bd.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_9244a31ddc0f494cac9f5a1c7ed4703b.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_off00006862.bin
619a44e8b5c2a2d3fc0e18259d8022938ad4f8b30552901bc68dc41c3d0f2ef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6862 2880 bytes
font_01_sfnt_off000072a0.bin
98343febdc89fe2ebdec45cbddaa05af55912210e73f27b99565df33afa19c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A0 5164 bytes
font_02_sfnt_off00008425.bin
3ee867abeb98ef2d64db629acd3c6c2168727509a6204142c3d2fe35ba0202dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8425 9812 bytes

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