Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e6b1c4f24373d7…

MALICIOUS

PDF

51.0 KB Created: 2020-08-03 12:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31e9fdeb42a6776b6bd2c6573c4e6937 SHA-1: 3b7490da3d6e80072173bf9f29bde8b61aa01451 SHA-256: b9e6b1c4f24373d7121e50b7a9a3bf768b774ba08ecf6f832ca9234aca108f04
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=los+escritores+de+la+libertad+pdf'. This suggests the document is designed to lure users into clicking malicious links, potentially leading to further compromise. 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.cc/pify?keyword=los+escritores+de+la+libertad+pdf
    • http://files.azhealthpath.com/uploads/1/3/1/6/131606159/vutunakasorexex-xabofapogakoxi-bemufo-fuparofaw.pdf
    • http://files.artbyhansgeist.com/uploads/1/3/0/7/130738548/sexakirikiziwagoti.pdf
    • http://files.jonaspuru.com/uploads/1/3/1/4/131453432/40ef9d2f279.pdf
    • http://files.kingcountyexplorers.com/uploads/1/3/1/8/131857983/bemuparasi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0631/1070/files/64768527755.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1676/files/85053742360.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/79765962225.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/wuzuxego.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/5480367197.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/24429753114.pdf
    • https://cdn.shopify.com/s/files/1/0429/0225/7823/files/86564324205.pdf
    • https://cdn.shopify.com/s/files/1/0428/7810/7811/files/guladesemaj.pdf
    • https://cdn.shopify.com/s/files/1/0451/1626/0517/files/save_powerpoint_slide_as_image.pdf
    • https://cdn.shopify.com/s/files/1/0431/9733/3664/files/piwarawutinewokoxiguji.pdf
    • https://cdn.shopify.com/s/files/1/0438/3699/7792/files/auc_in_r.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_off000077c3.bin
67b0ce9b568d83334ee50cf02b81b4fecd5c014f3221277783032223784e0ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C3 4912 bytes
font_01_sfnt_off00008882.bin
2e203cf821ff5f76c45732e1f11d482b89ffd9653dfd72b04924d7578562c2e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8882 11684 bytes
font_02_sfnt_off0000aec6.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC6 4324 bytes

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