Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51232f443c38afb…

MALICIOUS

PDF

40.6 KB Created: 2020-08-30 19:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dd330e09488d9ff399fd00ed5287a1f SHA-1: 497435008dde13282f802dcb31595c682b3ac012 SHA-256: f51232f443c38afbe6579e2887c3bb6f8aee31c4b1cd4162984e2713ac9cedad
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, many of which point to external resources, a technique often used for SEO poisoning or to obscure malicious destinations. The primary malicious link, https://ttraff.cc/wix?keyword=emotional+survival+for+law+enforcement+kevin+gilmartin, is identified as a redirector to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'Emotional survival for law enforcement' and the wkhtmltopdf application, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=emotional+survival+for+law+enforcement+kevin+gilmartin
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/12856172016.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7068/files/kijobakulixefawewajejam.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/16910739947.pdf
    • https://static.usrfiles.com/ugd/1decf9_ba24d674546d481aae3d239d31f051ed.pdf
    • https://static.usrfiles.com/ugd/10e3af_e73bde3790e54606983e40ddd666b1d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_39d101f5df8f412494bf6d202484333c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8725122567ee40dab0aea424436dcdea.pdf
    • https://static.usrfiles.com/ugd/b8c837_e31805ad2bf1404c9b482ac49583b423.pdf
    • https://cdn.shopify.com/s/files/1/0429/8473/4883/files/19378118467.pdf
    • https://cdn.shopify.com/s/files/1/0450/7772/5347/files/planos_de_casas_modernas_de_2_pisos.pdf
    • https://cdn.shopify.com/s/files/1/0436/1895/9523/files/manualidades_material_reciclable_botellas_plasticas.pdf
    • https://static.usrfiles.com/ugd/b8c837_e21ebc83e53545c0992db7a8490f7f50.pdf
    • https://static.usrfiles.com/ugd/7041e4_3fdadd392bd640519dc0cb5cd461434a.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_off000060af.bin
40d5c41b7385c98a4c31ee933b7150abc69691de4e0c36e282c64c10645508d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AF 5372 bytes
font_01_sfnt_off000072fa.bin
7df941426184ffe02fb3f8af9d496753ca922356625add3310593902f8ace444		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FA 10048 bytes

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