Malicious PDF — malware analysis report

Static analysis result for SHA-256 320db499d97e0faf…

MALICIOUS

PDF

40.2 KB Created: 2020-08-29 07:38:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc3427f0b709cf2851c8568b44d689bd SHA-1: 2f681c3f574cc2c5dec5ffa1ede65342c83c5f61 SHA-256: 320db499d97e0faf76e5b4f4be595a077b6e98c5503fe311869dd4c45c1d0e7b
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. The document body, though heavily obfuscated, contains the same URL and a keyword suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves tricking the user into clicking the malicious link.

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/wix?keyword=millwrights+and+mechanics+guide+5th
    • https://static.usrfiles.com/ugd/b8c837_94c0e0674ccd44a6a766eb1fc515bb00.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ec4c17ae9014076ab6ccb8166437399.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff703c0d33cb4a80b47ef19621187e8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d8441a70bc44e55ae114e39340b9f0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ee56da3962946a6b66980bc93c3630a.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/fupowimupuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/8159/6066/files/36499929332.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7776/files/kezedetubidadomefipefapug.pdf
    • https://cdn.shopify.com/s/files/1/0432/0120/0288/files/fitenevujebubej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sarexomerowomowubufo.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_off00005e61.bin
052d8cfaf86ab7739e2a7d0fb7cbebf0eae6f51c44e29ce3c621c2a6b18746a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E61 5572 bytes
font_01_sfnt_off0000713c.bin
7fc0350e1a8b42fb427d7faebbcc5c641d0e63c8eae7ed5fb7a65ca16dc2840a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x713C 10064 bytes

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