Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a55e918dad8e4c7…

MALICIOUS

PDF

151.3 KB Created: 2020-08-05 09:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6b1a9c06066dc3d2c09ece440a97a5f SHA-1: ff9dd70f9a4bfcd37a06375505c4f9cd8dae6eef SHA-256: 8a55e918dad8e4c79bf7ff43e604734656fd08b15295a3165ab31ce0b0361ee7
92 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that is also listed in the heuristics. This suggests the primary goal is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/pify?keyword=gastrointestinal+tract+hormones+pdf
    • http://files.thesomervilleflea.com/uploads/1/3/2/3/132303374/b022f592f22b7.pdf
    • http://files.usminiaturehorses.com/uploads/1/3/1/4/131437941/debofakudisetig-peviwenelof.pdf
    • http://files.unohitvbc.com/uploads/1/3/1/8/131860378/8036133.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/yu_yu_hakusho_blu_ray.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/81619719093.pdf
    • https://cdn.shopify.com/s/files/1/0427/6997/3415/files/liberalismo_politico_y_economico.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/zebelifiveg.pdf
    • https://cdn.shopify.com/s/files/1/0434/0449/2950/files/levurosamu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1461/8277/files/42038109007.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/local_weather_plano_tx.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/somerurunem.pdf
    • https://cdn.shopify.com/s/files/1/0431/3877/7249/files/3605194958.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7624/files/67440653250.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0350/files/kirumolaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/4778/8450/files/68000598318.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_off0002175c.bin
0fc83eb299a68b304b6539b29d39a1fe08041ce300856a0eaf1b552de245651f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2175C 5428 bytes
font_01_sfnt_off000229a2.bin
e1dc1cd548f21a879d327ba713181d03b0f94db053802d2f50d8e8194ffa5ef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x229A2 10976 bytes

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