Malicious PDF — malware analysis report

Static analysis result for SHA-256 daece6a3a7b50ecc…

MALICIOUS

PDF

31.1 KB Created: 2020-08-30 23:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d769412432cef0c6d598ffbc2f65874a SHA-1: ab7141c20ee72d2d62213990b360da7e661e8c2d SHA-256: daece6a3a7b50eccb2138eaea680f0ddf773b9a172ce27663e61928f007c0274
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=phavy+prieto+saga+ordinales+pdf', which is also listed as a malicious redirector. Additionally, the PDF contains a large number of embedded URLs, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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.club/wix?keyword=phavy+prieto+saga+ordinales+pdf
    • https://static.usrfiles.com/ugd/b8c837_ff9c458bac2745cea8ec4995a6493a68.pdf
    • https://static.usrfiles.com/ugd/9e41f0_8efd73226dac415eba8344ab95f6ef5e.pdf
    • https://static.usrfiles.com/ugd/8c0e65_a47249a02ac4420db5b9e99c5dcc8f4b.pdf
    • https://static.usrfiles.com/ugd/0511f5_bebc6064c39f40e4ad79d2c91c3ea23a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d850ccd029d4e1cb951f54a314fe7d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_59962bd600ad464d9eb0dc9e5e75b475.pdf
    • https://static.usrfiles.com/ugd/b8c837_86e99511f69c406393a8b64b56dfe739.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2262/files/mesiwokufodavewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9116/5333/files/95926242308.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/agriculture_notes_in_marathi.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_off00003f26.bin
0282f475a6778430e8aa0e6185da2a8ba774879f9eed641b0cb332180e8d1539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F26 5464 bytes
font_01_sfnt_off000051c1.bin
f11ba4a6fb6d6629e496ca63108fbc6dd4abfe395560f10285366a3efb74e59f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51C1 9000 bytes

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