Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08881b0d3a7b5ac…

MALICIOUS

PDF

51.8 KB Created: 2020-09-04 16:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4960ce0a3cd535502a4732eee8f2d83 SHA-1: 43f26013d32e5b981d7b9c6909812b6da28acf56 SHA-256: b08881b0d3a7b5acf59c47a904e531cd7e80cdac17f6f5b31a4db4a8bd000a39
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily garbled, contains text that appears to be a lure related to 'Cambridge examiners reports maths'. The PDF also contains a large number of external links, as noted by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection strategy. The ML classifier also strongly indicated maliciousness.

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=cambridge+examiners+reports+maths
    • https://static.usrfiles.com/ugd/36f25b_8057787720eb430bbc38a44525c72742.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_c6d34f4e888642b0b75a7e9ee1db2fc4.pdf
    • https://static.usrfiles.com/ugd/afe78f_6e716ac2a16e48449f7560a082e2a6f1.pdf
    • https://static.usrfiles.com/ugd/b444d4_586925db0d004e53a53580af37e7e6c4.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_6f518e2106ff4634b034c6a0c3a64e05.pdf
    • https://static.usrfiles.com/ugd/ace02d_ceaffadb2eb540ecbe8e58ee0f2757eb.pdf
    • https://static.usrfiles.com/ugd/9b33c5_d905df9cc9914b87af255768b299b78a.pdf
    • https://static.usrfiles.com/ugd/136d07_2514aa84211a4ced90fb0e9d7df90e66.pdf
    • https://static.usrfiles.com/ugd/73c254_941e3d692dfe48cfb8c5a3b4340e542a.pdf
    • https://static.usrfiles.com/ugd/7f16bd_bb210f4091864213af94f10a412be8b3.pdf
    • https://static.usrfiles.com/ugd/b8c837_8853e814d99146798869e068d739845e.pdf
    • https://cdn.shopify.com/s/files/1/0439/4798/3006/files/tojuvawe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/xulizapom.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000667a.bin
0c0dc9ea00d1b841d4a86b09058c12288b8dad4337d8c18331dbc6b6a1cc5f59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667A 5452 bytes
font_01_sfnt_off000078c4.bin
e3f5d55375da7beccf1bcbf1ea9ddaff8e022a8712c7dbc2759b4128e1a3637f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C4 2608 bytes
font_02_sfnt_off00008439.bin
84cf34b9665ed2b78d8c1b5ab7b25915ecd3964779e7838c0d455985c42784f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8439 10116 bytes
font_03_sfnt_off0000a70c.bin
a0988ac118ce8b00321e185a18c3992bd2e532f52c477d5101531b98e111566a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA70C 18336 bytes

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