Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e8c7ca263fbb25…

MALICIOUS

PDF

41.4 KB Created: 2020-08-24 02:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2690e02c78a7f4b2d8d4724ae79cd4c SHA-1: ca310adb53d78afc8b8e73463f9a53f93df6e846 SHA-256: f4e8c7ca263fbb257d50480ef4be9c4466362ee97490a10320b84eece0a1af77
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains garbled text but also includes the malicious redirector URL and several benign-looking PDF links, suggesting a link farm designed to obscure malicious intent. The primary attack pattern involves redirecting users to malicious infrastructure.

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.ru/pify?keyword=bossa+nova+musicas
    • http://files.caleotravel.com/uploads/1/3/0/8/130814232/1156775.pdf
    • http://files.lafayetteorchestra.org/uploads/1/3/0/7/130775063/3775681.pdf
    • http://files.tenderlovingcarechildcarecenters.com/uploads/1/3/2/6/132682441/4308088.pdf
    • http://files.cleanoceanfoundation.com/uploads/1/3/1/0/131071243/23e321f.pdf
    • https://cdn.shopify.com/s/files/1/0432/2109/0471/files/axial_flow_compressor_noise_studies.pdf
    • https://cdn.shopify.com/s/files/1/0430/5561/2058/files/oxford_bookworms_library_stage_1_titanic.pdf
    • https://cdn.shopify.com/s/files/1/0431/5555/4470/files/cardiogenic_shock_review.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7678/files/mac_install_python3.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/dasorajarudubalenuzefipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5239/files/99025578519.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9363/files/fishbone_diagram_template_powerpoint_blank.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/79490203184.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/parliamentary_procedure_worksheet_activity_1._02._02.pdf
    • https://cdn.shopify.com/s/files/1/0432/1617/5263/files/86666335240.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000645b.bin
d4cad99c8a41f51ea95f4414e5e681d3da0c0881e37f22a78c5d7cec450aa077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645B 4924 bytes
font_01_sfnt_off0000750f.bin
2a0d0b4c1a05d20d5eefae4f320e63583629c8307c4f12d41742daf099ad3ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x750F 10588 bytes

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