Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8b3a8f8ce4299a…

MALICIOUS

PDF

38.8 KB Created: 2020-08-01 21:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0a8c557f9c70a2c36d839e62b20be0f SHA-1: 74c3e4fa0582f55813be48360a74adf065083703 SHA-256: 3f8b3a8f8ce4299a136340ecc1126643aec0aa389123297f466c7eb43d5ef114
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=puntos+de+partida+workbook+pdf. The document body is heavily obfuscated, but the presence of many external links, including those hosted on Shopify, suggests a link farm or redirection strategy. 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.ru/pify?keyword=puntos+de+partida+workbook+pdf
    • http://files.pottingwithpotter.com/uploads/1/3/1/1/131163969/4698086.pdf
    • http://files.infinite-life.com/uploads/1/3/0/7/130738765/7deff942d9a0f2e.pdf
    • http://files.katherinefusco.com/uploads/1/3/1/4/131453267/xalim.pdf
    • http://files.ecooutpost.org/uploads/1/3/1/0/131070894/5384652.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/35901703840.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/getudokelesixasebipibuve.pdf
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/87485160363.pdf
    • https://cdn.shopify.com/s/files/1/0435/6702/2239/files/6546690071.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/6375511203.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/85591705025.pdf
    • https://cdn.shopify.com/s/files/1/0438/9080/2856/files/boripewotivozuvorumevebu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/zalirupatogajonexap.pdf
    • https://cdn.shopify.com/s/files/1/0449/4727/5931/files/getline_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/relion_wrist_blood_pressure_monitor_manual.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_off000058d3.bin
115d9f6a23860c7e3aaac74f2bfe04928c14461d9b4bc56d53b444ff0c941572		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D3 5300 bytes
font_01_sfnt_off00006af8.bin
695ea430cad142ffaec3980a6e48dea1bc5beea6aae2d0b009e441e7be2fa230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF8 10412 bytes

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