Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fde8e885a1c149…

MALICIOUS

PDF

44.8 KB Created: 2020-08-31 14:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a00ca1c661e0c7fc530075d154e8dba SHA-1: 92ba1f04fcc7b353d34739f92246ad33bb466b0b SHA-256: b6fde8e885a1c149dae8bd95c9f193b62f7d601c415bd3c2a9bdfb67b88cd86e
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=camera+movements+guide'. Additionally, another critical heuristic indicates a PDF link farm, with numerous external links, many hosted on 'static.usrfiles.com'. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and embedded URLs, suggesting an attempt to disguise malicious content. No scripts were extracted from this sample.

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=camera+movements+guide
    • https://static.usrfiles.com/ugd/b8c837_8d49e5c5caf9482085299ed73482cb7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_fba881b756674e429f852991f1cceaf2.pdf
    • https://static.usrfiles.com/ugd/b8c837_855f772ebb2943a78ef9bfa6a3b7f4fb.pdf
    • https://static.usrfiles.com/ugd/8127dd_189a384dfe0a4af3885a337defcc2a29.pdf
    • https://static.usrfiles.com/ugd/73c254_d4a7f39026bb447888d6fefffc98c4a5.pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3654/files/zevekusupazumitoriwoli.pdf
    • https://static.usrfiles.com/ugd/2f07a1_54820499ff3b442b9dc2e1e8bee54648.pdf
    • https://static.usrfiles.com/ugd/fdee49_10a61a74f72648529d13ab795f1b928d.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_86a73a655e504edcae02d50f2b06d2fc.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_17e41df9546744f69882ccd7d0b96e84.pdf
    • https://static.usrfiles.com/ugd/868401_636893161af1449f8b04c816800421bd.pdf
    • https://static.usrfiles.com/ugd/d99ef3_ee80bf5d34b24fc5a63f69475b65eba5.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fbb4db14bcf4200b898f6145b9b1716.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b584c5a188d44db894cea11f2a13cd0.pdf
    • https://static.usrfiles.com/ugd/89363e_1d0c89b5b14c4ad9a90cabc93fa2207d.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_off00006386.bin
628efadc778768835e9771efe5c4e31f01bf1413424b2bf7ff287f2b55b05f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6386 5080 bytes
font_01_sfnt_off000074b9.bin
c5df2dfd205fb25ba63ab1b73e635b6ff029f0dd2bbea3219648082d4c785aeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B9 10840 bytes
font_02_sfnt_off00009898.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9898 4324 bytes

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