Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c706bbb29042040…

MALICIOUS

PDF

41.8 KB Created: 2020-06-03 19:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35a97862098f9446187e800497786472 SHA-1: 2ff444182efb6cf8870efbb66bf2a9adb8bb9a53 SHA-256: 4c706bbb29042040bdea77f195c60b6dc2bd0e45c315ea551d173498321b8a12
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which are hosted on domains that appear to be part of a link farm, suggesting a SEO spam or phishing campaign. The document body mentions 'Rimworld cheat codes', which is likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://lenoxcapitalpartners.com/uploads/1/3/0/6/130620412/130620412.html#rimworld+cheat+codes
    • http://virtualrealitygalaxy.com/uploads/1/3/0/4/130483990/tijir_nibene.pdf
    • http://nativerootslandscapes.com/uploads/1/3/0/3/130379377/6559401.pdf
    • http://golfindianvalley.com/uploads/1/3/0/2/130270811/liwakofirabune-ruzoni-domekab-fisovolo.pdf
    • http://34management.com/uploads/1/3/1/4/131437573/5238528.pdf
    • http://butterflyridge.org/uploads/1/3/0/5/130541065/zivojetum.pdf
    • http://lenoxcapitalpartners.com/uploads/1/3/0/6/130620412/terms.html
    • http://lenoxcapitalpartners.com/uploads/1/3/0/6/130620412/dmca.html
    • http://lenoxcapitalpartners.com/uploads/1/3/0/6/130620412/policy.html
    • https://dopuzifiza.files.wordpress.com/2020/05/xesibisij.pdf
    • https://ranilemigij.files.wordpress.com/2020/06/mozexurukadugezevodasefel.pdf
    • https://livizox.files.wordpress.com/2020/06/tawefoxidoruvo.pdf
    • https://xodozolo.files.wordpress.com/2020/06/26006573680.pdf
    • https://vuvobifo.files.wordpress.com/2020/06/59226440107.pdf
    • https://rufutusizuk.files.wordpress.com/2020/06/65837204509.pdf
    • https://zopowozofoje.files.wordpress.com/2020/06/sazalowop.pdf
    • https://datefakifeba.files.wordpress.com/2020/06/68936980141.pdf
    • https://disumagovuza.files.wordpress.com/2020/06/71051201590.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_off0000772c.bin
e8c0232a1afc33cbdb710aa7f04c0295cc53c8dde52d0e34691c8513ba50af21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772C 10648 bytes

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