Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f916f1e8743ad03…

MALICIOUS

PDF

97.3 KB Created: 2020-09-11 15:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ad4fbe14c44cb1612c33ca2940322a7 SHA-1: 6de735d95e30b16530a2d654526769c6b279ab65 SHA-256: 4f916f1e8743ad03a36285c7f028d46eeb86c1ce965f16c1c662aa78c344937e
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wb?keyword=communication%20skills%20pdf%20kenyatta%20university'. This URL is presented within the document body, suggesting a social engineering lure. The file also contains a large number of external PDF links, characteristic of a link farm, further indicating malicious intent. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wb?keyword=communication%20skills%20pdf%20kenyatta%20university
    • https://static.usrfiles.com/ugd/32acb1_f5cb523f14544809bf285633f2bc2584.pdf
    • https://static.usrfiles.com/ugd/89363e_1a3044aaf8b1493fbc7ff7fb01ee84ef.pdf
    • https://static.usrfiles.com/ugd/5b9365_6739448ccc574272aa7249e6e1094da2.pdf
    • https://static.usrfiles.com/ugd/b8c837_eab64c9ed9e54033973e97e9cf7650f1.pdf
    • https://static.usrfiles.com/ugd/f5892c_0f51a99adec740139492b08a6d002e81.pdf
    • https://static.usrfiles.com/ugd/cb2bed_a50b2a7ee87643eda26c20288f0ef0f6.pdf
    • https://static.usrfiles.com/ugd/3f0e57_ba74a5e4e7ce45ffbdfe6653b3f7b083.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e84c3a076a2403c81f4902efef8e6a1.pdf
    • https://cdn.shopify.com/s/files/1/0428/8223/6583/files/78984640167.pdf
    • https://cdn.shopify.com/s/files/1/0461/0814/7876/files/barbara_guillen_actriz_mexicana_que.pdf
    • https://cdn.shopify.com/s/files/1/0438/3087/0173/files/39983216568.pdf
    • https://cdn.shopify.com/s/files/1/0436/3347/5737/files/towojopugadewew.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_off00012f1c.bin
8367cc7e89efc967de046942969656084d773d2ef547b390c7e6fa43954b396c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 5432 bytes
font_01_sfnt_off0001418f.bin
99703ef793c6ad4668cefa90bcb20243ffbf19926bc1fc8f9cc85f961b67912b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1418F 12696 bytes
font_02_sfnt_off000169d4.bin
8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169D4 4324 bytes

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