Malicious PDF — malware analysis report

Static analysis result for SHA-256 f611d7a5d55a4189…

MALICIOUS

PDF

45.2 KB Created: 2020-07-26 09:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7159c6450dadccebac9d83678b4f115 SHA-1: 785e597a1ab409b8b1053a0cd031ed1da0da1df8 SHA-256: f611d7a5d55a4189e78e8ab905fe45426106e932c1930b0d449f1d4a544ede1f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.com. Additionally, it features a PDF link farm hosted on Shopify, with multiple links to other PDFs. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain metadata related to football boots and the wkhtmltopdf application, suggesting a lure.

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=football+boots+size+guide+uk
    • http://files.singaporedrumshop.com/uploads/1/3/1/3/131379059/822b94cca95421.pdf
    • http://files.evolutioned.org/uploads/1/3/2/6/132680784/sawegalamoluzur_xatepaw_gazugepaluj_zuwiwividu.pdf
    • http://files.walkingdapper.com/uploads/1/3/2/7/132712096/tenoxotipofezokoku.pdf
    • http://files.thehomebodymum.com/uploads/1/3/0/7/130739802/9411627.pdf
    • http://files.thehomebodymum.com/uploads/1/3/0/7
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/vefebexenubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1410/files/53216872712.pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0922/files/26339409171.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/77501461682.pdf
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/bifudadev.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/12164385979.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/savowogofoxifonikili.pdf
    • https://cdn.shopify.com/s/files/1/0437/6831/6055/files/vitinuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23083433767.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/depogozef.pdf
    • https://cdn.shopify.com/s/files/1/0440/3062/3894/files/jafewowewexuzuganakap.pdf
    • https://cdn.shopify.com/s/files/1/0432/2807/0052/files/dapesukevofekexewavu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006048.bin
39da5a6d256357bd46d021b6f3fae544dd99f157194335f8dbd4b406d0f94b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6048 4884 bytes
font_01_sfnt_off000070f0.bin
038366e9a243f6dd75ef1c7f6ce78b64c5aa3e264b300efcd04fcf1d69bd76c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F0 9760 bytes
font_02_sfnt_off00009278.bin
c8364a576586dcba0503813edfb4d0ae0fa0f96db1ac5c9e518aae37fcbd9e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9278 16124 bytes

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