Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac7a5ff427bff63…

MALICIOUS

PDF

65.9 KB Created: 2020-08-19 22:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f31d5700d8b2fe3eeb5e28901f1a3cf7 SHA-1: eb4dea66357dfb8b1cb272721a093a8e0d239cdf SHA-256: dac7a5ff427bff63662d7b90e7ddbe3c0e649c29744fbe252e087928f80e9acd
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the link https://ttraff.com/pify?keyword=brandenburg+concerto+no+2+pdf directs to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many hosted on cdn.shopify.com, suggesting a link farm designed to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=brandenburg+concerto+no+2+pdf
    • http://files.ewoptx.org/uploads/1/3/1/0/131070457/zekowexapis.pdf
    • http://files.wofcca.org/uploads/1/3/1/0/131070539/4ef47ada.pdf
    • http://files.severnsoundings.com/uploads/1/3/1/4/131406390/muzepef.pdf
    • http://files.suzukiviolinschool.com/uploads/1/3/0/7/130775434/zedelaze.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/revumoxeso.pdf
    • https://cdn.shopify.com/s/files/1/0438/2926/4546/files/kezuxulaxelumaru.pdf
    • https://cdn.shopify.com/s/files/1/0430/6167/4133/files/7895615623.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/36673572360.pdf
    • https://cdn.shopify.com/s/files/1/0428/7466/7164/files/xiveniguzowuzodarazi.pdf
    • https://cdn.shopify.com/s/files/1/0437/2722/4986/files/minecraft_wwe_skins.pdf
    • https://cdn.shopify.com/s/files/1/0433/0877/7637/files/22983379997.pdf
    • https://cdn.shopify.com/s/files/1/0440/5254/5701/files/39666472630.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27055139941.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2456/files/1802696857.pdf
    • https://cdn.shopify.com/s/files/1/0436/3098/5376/files/42162243221.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a12e.bin
b90901935ad289c0c9862c32ca5a2bdbf61cae22a8a156efee3df265d818d228		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA12E 5268 bytes
font_01_sfnt_off0000b316.bin
71f2657407e6f4b7310d5989bc15076dd47555f6d72595537f7949e78722c937		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB316 10400 bytes
font_02_sfnt_off0000d6f6.bin
15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 16120 bytes
font_03_sfnt_off0000ebdd.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDD 4324 bytes

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