Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcac4f5dc09d3c0…

MALICIOUS

PDF

124.4 KB Created: 2020-08-31 00:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc0b223da07d53f333468d577ee61c91 SHA-1: 693daaa968391b1c0d1698580abfe1a0bbaf138a SHA-256: cbcac4f5dc09d3c0e74445582264462cb477b34f6a8eb1a1f8797b551f4d0a2d
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely intended to lead users to further malicious content. Another critical heuristic indicates a PDF link farm, suggesting a potential SEO manipulation or redirection scheme. The document body contains garbled text but includes the URL 'https://ttraff.com/wix?keyword=apostila+de+c', reinforcing the redirection finding.

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=apostila+de+c
    • http://www.olinux.c
    • https://static.usrfiles.com/ugd/0d089b_981ed798d6074e32a7b2f23b8909d6a5.pdf
    • https://static.usrfiles.com/ugd/d775a9_6f9b5084626747c69367fba93b298b39.pdf
    • https://static.usrfiles.com/ugd/856cea_1b56775f36ac41c6a6048042588e4efa.pdf
    • https://static.usrfiles.com/ugd/b8c837_23fd4484a92a4616b0e93462d91a9c37.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fcc576ca8564adf9185efd0e838529a.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_6f180584879548bb9bf06cec6c018780.pdf
    • https://static.usrfiles.com/ugd/bfbc46_21425d189c504345aa7c8b74a9833c4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ad7be5c8a2d49129316fa4099f232aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_f27b1b26760645159a8becefc4c798b6.pdf
    • https://static.usrfiles.com/ugd/e8506d_c0a3d24fe4114029b44c168c389c1ac3.pdf
    • https://static.usrfiles.com/ugd/3eed2b_0195162226164d61bbe65538b65cb858.pdf
    • https://static.usrfiles.com/ugd/3fc21f_2e11f49312434bc4901b9b134b9feae8.pdf
    • https://static.usrfiles.com/ugd/99965f_e9d14b61613d492ab8bc7c1b663c9fcf.pdf
    • https://static.usrfiles.com/ugd/f55bec_efb6399f6d5d43e6aafdce0de8a46c5b.pdf
    • https://static.usrfiles.com/ugd/97493d_e42d5188448f45808ebcb98f7dc33fd4.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_off0001982b.bin
167759d43af905b4fedd53d164009a708a3ed4250549cc70f6bc223773b30422		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1982B 4640 bytes
font_01_sfnt_off0001a7f3.bin
0ec964ee426a10bf8da37540a4f008da31d8e524f8cc203002aef9e20df230bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7F3 15488 bytes
font_02_sfnt_off0001d51d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D51D 4324 bytes

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