Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5921e54c93cf3d…

MALICIOUS

PDF

69.0 KB Created: 2020-06-01 10:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 164516ddf34cfc45146ad2d264fba6c8 SHA-1: 6b737b95744ed1ac2bf326d396402cc62b86d773 SHA-256: 9e5921e54c93cf3d72c527190fdca1b027f9c1076a223ef55b8c4ce9a4e838a1
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, indicating a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs point to domains known for hosting malicious content, suggesting the document's primary purpose is to redirect users to harmful sites. No scripts were extracted, but the PDF structure itself is the delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wp3?keyword=pioneer+avh+x5500bhs+manual#pioneer+avh+x5500bhs+manual
    • http://gandalphs.com/uploads/1/3/1/3/131384185/7644903.pdf
    • http://aidenpriceracing.com/uploads/1/3/0/3/130379183/9f06b5e56e0.pdf
    • http://paparics.com/uploads/1/3/1/3/131380356/9016699.pdf
    • http://blackhair360.com/uploads/1/3/0/4/130435966/puxizufewizizilu.pdf
    • http://mastermoose.ca/uploads/1/3/0/2/130288893/kejoxonivupedosumes.pdf
    • http://willemwijs.nl/uploads/1/3/0/6/130639896/4535133.pdf
    • http://victorpribyl.com/uploads/1/3/0/2/130287257/fcaa4a2.pdf
    • https://wabuvodu
    • https://zakudapure.files.wordpress.com/2020/05/83494093925.pdf
    • https://wabuvodulix.files.wordpress.com/2020/05/10891808970.pdf
    • https://kipevofi.files.wordpress.com/2020/05/tobafukonitefixasavope.pdf
    • https://linapejurax.files.wordpress.com/2020/05/97226195080.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b1.bin
58f517b5d8801b3f2cf8b8b4667ee270eb184040d4d0676324ac817b58dacc69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 11196 bytes

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