Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc734627992a85f8…

MALICIOUS

PDF

44.5 KB Created: 2020-07-18 03:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e554de29c3d9d3cc7672622c6c15bd06 SHA-1: 179b9f9a927d2a602438b6221e5360dd9d81c5d7 SHA-256: bc734627992a85f81aadaab077c9876e8a22aa66312afbee7ef9c6269ecd14c6
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware distribution site. The document body text is largely unreadable due to encoding issues, but the presence of 'wkhtmltopdf' suggests it was generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/wb?keyword=jonathan%20livingston%20seagull%20summary%20pdf
    • http://files.balancedwellnessnutrition.com/uploads/1/3/0/8/130814459/6764586.pdf
    • http://files.uniqorner.com/uploads/1/3/0/7/130739053/63f1d06a8cdee.pdf
    • http://files.gregbrownportfolio.com/uploads/1/3/1/6/131637357/3552b.pdf
    • http://files.corecontemporary.com/uploads/1/3/1/1/131164419/gasowezumawozux.pdf
    • http://files.corecontemporary.com/uploads/1/3
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/xewutofogokoneja.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1042/files/ruvuxesowagorofodubet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2328/5920/files/fananumikanipexumaji.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/bogeb.pdf
    • https://simupem.files.wordpress.com/2020/06/92473457950.pdf
    • https://dimogewi.files.wordpress.com/2020/07/10480255431.pdf
    • https://pitosabutage.files.wordpress.com/2020/06/povodonujapuzisusale.pdf
    • https://jagunijo.files.wordpress.com/2020/06/79035457782.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/13114859134.pdf
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/73493824757.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27347714529.pdf
    • https://cdn.shopify.com/s/files/1/0430/4853/4167/files/wepatowovutolukudisipidu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/3979372757.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/votisevabaduso.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_off0000727b.bin
5e4016ff55f0e03e344905b300f555337ba48b4eec3053c6c224830c304c4c6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727B 5488 bytes
font_01_sfnt_off000084ff.bin
13d9992e3294763ae4eed6e1b7278ffe06efe4e52c6ffdf41aa0d0571ff00cef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FF 9276 bytes

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