Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ed8478c7fe95b1…

MALICIOUS

PDF

37.8 KB Created: 2020-08-17 06:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a391bf70370750568df2e3a6aa204877 SHA-1: 93c9b35f94b06b34db7425c27b4c5510d33c4c51 SHA-256: f6ed8478c7fe95b139fb431da79eb26070b2e81177148d411beb01cfeb1c5faf
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which points to `ttraff.cc`. This URL is embedded within the document body, disguised as a search result for 'Cambridge igcse computer science pdf'. The PDF also contains a mass external link farm, with many links pointing to Shopify domains, but one suspicious link to `xofikal.green-runners.com`. The ML classifier also flagged this PDF with high confidence.

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.cc/pify?keyword=cambridge+igcse+computer+science+pdf
    • http://xofikal.green-runners.com/uploads/1/3/2/6/132695663/nipuxejekajis_tadezijavabu_kawegisuresib.pdf
    • https://cdn.shopify.com/s/files/1/0437/6880/7578/files/37915674550.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/vobutup.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/adding_decimals_worksheet_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0431/9779/2420/files/50998337035.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/35821731234.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/calendrio_escolar_2020_e_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/1454/4808/files/gotosozenevubos.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6435/files/bixejotulizapoletuxej.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/fuwezigajakidaxof.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3979/files/beraxikemixiwul.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/99759960893.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_off00004dbd.bin
5cd0e56697894ec4e236e1ac25a8c2de22cb74f0f7d3cb5c8a67b9433c07e414		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DBD 5488 bytes
font_01_sfnt_off00006049.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6049 1800 bytes
font_02_sfnt_off000068d5.bin
ab601d392f92fb11939506fc7eeb8952197d091220ad2d15db0163403f0dbe82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D5 9896 bytes

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