Malicious PDF — malware analysis report

Static analysis result for SHA-256 734566b673f8fd5c…

MALICIOUS

PDF

39.2 KB Created: 2020-08-28 21:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bedc738a9546bc9d309310969a9709c SHA-1: e395e1ec7314bc2a4828a1e1436bde12ff296214 SHA-256: 734566b673f8fd5c47061f94c4e0a8b3c37bdf24e31d7530830450db4d6a84c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting an attempt to lure users to external content.

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=freshwater+bumblebee+grouper+till+sa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_bdc485f64a9e4057b15f325d968dca48.pdf
    • https://static.usrfiles.com/ugd/b8c837_e78df294ef654ab2b940ce7421fba450.pdf
    • https://static.usrfiles.com/ugd/b8c837_594b8dfe8dc34ac1bcaae8dfa4a08d61.pdf
    • https://static.usrfiles.com/ugd/b8c837_153ecf9950d243c89120531898891fff.pdf
    • https://static.usrfiles.com/ugd/b8c837_da2133d936164a218f79a8d2f4a3d882.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0f184f9bf4349768a38ab38577e1672.pdf
    • https://static.usrfiles.com/ugd/b8c837_c73295986d444f3382ac896738b636b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b344450f25b49bf95e1d2fa05b85f01.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f5ae58e2d734e10b331da350aea6af8.pdf
    • https://cdn.shopify.com/s/files/1/0441/4049/5000/files/alphabet_russe_en_francais.pdf
    • https://cdn.shopify.com/s/files/1/0432/3259/2040/files/88721873873.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b73.bin
a7bc09778b15e1999fd3a80e54dfa58dbf2d47a9e986ff39994a8f13d1992ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B73 5420 bytes
font_01_sfnt_off00006dd1.bin
263246820a909df2c9b0b672a52cf943adf88b40ca55fbc352796b4fc6963370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD1 10144 bytes

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