Malicious PDF — malware analysis report

Static analysis result for SHA-256 c246d800c94cb10d…

MALICIOUS

PDF

56.0 KB Created: 2020-08-05 02:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a409a903c59d79d36f124c09ecf36e0c SHA-1: 3d5f1cbed998f1b969564fd7cb8109109b566936 SHA-256: c246d800c94cb10d64ae3793a0c87293b408b17f4ee4d79258a8e8d98609c2ed
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily corrupted, contains text that appears to be a lure related to 'Kaplan chemical pathology pdf'. The presence of numerous PDF links suggests a link farm or redirection strategy to obscure the final malicious destination. No scripts were extracted from this sample.

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=kaplan%20chemical%20pathology%20pdf
    • http://files.amberrosedische.com/uploads/1/3/0/8/130873804/bubuj-bivapuwim.pdf
    • http://files.straymongrel.com/uploads/1/3/1/8/131871894/4cc60b638a0f8e.pdf
    • http://files.wingcrafters.com/uploads/1/3/0/8/130814205/7242032.pdf
    • http://files.octaviaharris.com/uploads/1/3/1/4/131408741/nuzud-wawubadikixu-lebonigidoxeb-bidigazer.pdf
    • http://files.chemaroma.com/uploads/1/3/1/8/131856353/sejoberis_zikejinisize_kamaganurudixad.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/73127611753.pdf
    • https://cdn.shopify.com/s/files/1/0437/9367/8497/files/sefafalit.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/68248530353.pdf
    • https://cdn.shopify.com/s/files/1/0431/5516/1252/files/kebozifonazixopow.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/18815191862.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/nogumogagat.pdf
    • https://cdn.shopify.com/s/files/1/0435/2635/7152/files/fowudovobi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/jafewufegokalimatogo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21533622499.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3939/files/rigevipaduva.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_off00009d79.bin
f8ece2b179e8e707120ca811f5d4c286609240e95dae6eb093af212bfa611d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D79 5368 bytes
font_01_sfnt_off0000afa9.bin
25e57ba4ca9b4365f4155f411b62340376b7ea6b2561243683b47efe44ff7841		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA9 10620 bytes

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