Malicious PDF — malware analysis report

Static analysis result for SHA-256 8634153dd4dbe81c…

MALICIOUS

PDF

47.3 KB Created: 2020-07-30 23:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e717b4551e4bc0024397c613d5ff5196 SHA-1: 761904585bc93fef94103fc77357a6907dd35735 SHA-256: 8634153dd4dbe81c814c8a8e84c60042bb91bc0fd8bfb04270458e7ce6bac0b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a link farm with 18 external PDF links, many of which point to benign Shopify URLs, but one critical link redirects to a known malicious infrastructure at ttraff.cc. The document body, though heavily obfuscated, contains keywords related to 'piano sheet music free pdf' and 'wkhtmltopdf', suggesting a lure to disguise the malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=bare+necessities+piano+sheet+music+free+pdf
    • http://files.kskydonner.com/uploads/1/3/1/6/131607131/wedagazumexagexatit.pdf
    • http://files.paulblatherwickpropertyservices.com/uploads/1/3/1/1/131164350/kewilenafidu.pdf
    • http://files.langsidebedandbreakfast.com/uploads/1/3/0/8/130873996/6656001.pdf
    • http://files.sacpdm9.com/uploads/1/3/0/9/130969310/0db305feb36d.pdf
    • http://files.langsidebedandbreakfast.com/uploads/1/3/
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/4034708466.pdf
    • https://cdn.shopify.com/s/files/1/0433/6294/3144/files/54567338795.pdf
    • https://cdn.shopify.com/s/files/1/0434/2261/3654/files/89935278729.pdf
    • https://cdn.shopify.com/s/files/1/0433/6621/9941/files/pajuboju.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/nagova.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2043/files/bilurudoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/64164790079.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/jurulalenoririra.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/xokopakinatixelinusut.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/komukizodozis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0559/files/zumimisexojiwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/8997669177.pdf
    • https://cdn.shopify.com/s/files/1/0430/8218/6905/files/tagaresipuforo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4519/0821/files/76750704281.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_off000079e4.bin
c1e5b5954a0e95440611c85bd9f3adbafb52834b10346869ed1d54e52980cb6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E4 5296 bytes
font_01_sfnt_off00008bab.bin
efb16b734aeebb9a87d86744b1c5ce3d63058afa065bac188fbae0aeec6ec3ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAB 10864 bytes

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