Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9a822c60f28418…

MALICIOUS

PDF

49.6 KB Created: 2020-08-31 11:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e74ffc085e52f34ad3d78dea64af28 SHA-1: 7efc3b187f38a1433fb876245746d29112b567c6 SHA-256: cd9a822c60f28418f65caf06584c88cc0e79b175b5d471c6281974e49c13aed5
154 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 exhibits characteristics of a PDF link farm, with numerous embedded links to external PDF files, many hosted on 'static.usrfiles.com'. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering through deceptive links within the document.

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=el+cantar+de+los+nibelungos
    • https://static.usrfiles.com/ugd/b13fd1_f6adb113b6cc404990798967790dd657.pdf
    • https://static.usrfiles.com/ugd/b8c837_4efb80aefb604543b9579b418baff67c.pdf
    • https://static.usrfiles.com/ugd/9421c8_1c08aa94e091440998e5ea563455160b.pdf
    • https://static.usrfiles.com/ugd/b8c837_31d8b11be27e4e3fba4150704e3391fa.pdf
    • https://static.usrfiles.com/ugd/3d0627_7f8296ee3d4f4599b3a658425e24f8b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c2fb3c5568142cc918ed01661173540.pdf
    • https://static.usrfiles.com/ugd/930050_ccf3fab763544ddeafb12c1740f51457.pdf
    • https://static.usrfiles.com/ugd/eaf48f_1199ef7348b14505a5eeee69217cd004.pdf
    • https://static.usrfiles.com/ugd/b8c837_991e4aabd90e40d9a871c1730d796e90.pdf
    • https://static.usrfiles.com/ugd/cc03df_bb8f6562641e4947a19317304fcd6170.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_off00008108.bin
6489971bf142a2ddf70c0065d7c4817e694fe637aceecb971526fefb7bf66c83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8108 5204 bytes
font_01_sfnt_off000092bb.bin
444f6bd51730205afd19a8dead4233a35e73cf7422f1511a1d2c30aa0053fef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92BB 11332 bytes

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