Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb25cbeac4e47b45…

MALICIOUS

PDF

47.8 KB Created: 2020-04-11 21:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 08efda9e5305023f113408c6dd5ac4cb SHA-1: eb1941a5d3c60797a3d15f5a3eb7812f18b7d261 SHA-256: bb25cbeac4e47b458fe826a804583b09c255ea9b04430c84b8823ff365ca4b20
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on unrelated domains and appear to be generated programmatically. This technique, identified by the PDF_SEO_LINK_FARM heuristic, is commonly used to distribute malicious content or engage in SEO spam. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to a network of suspicious URLs, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bshppopup.com/uploads/1/3/0/6/130639910/130639910.html#silk%27n+flash+and+go+express+stopped+working
    • http://purelytakenphotography.com/uploads/1/3/0/4/130489536/jovixisuzu.pdf
    • http://relaytour.com/uploads/1/3/0/7/130740072/4739987.pdf
    • http://corollacoffee.com/uploads/1/3/1/3/131384340/jeledarisubuza.pdf
    • http://thequiniousaction.com/uploads/1/3/0/5/130541462/zurotisojupuze.pdf
    • http://chrisloganministries.com/uploads/1/3/0/7/130738989/7315376.pdf
    • http://totallandscapingcare.com/uploads/1/3/1/3/131383613/e1cfeea.pdf
    • http://trujillopropertyservices.com/uploads/1/3/0/6/130621370/85805d35e3a33b6.pdf
    • http://selflovethehonestjourneyofa20somethingyearold.com/uploads/1/3/0/7/130775214/7617731.pdf
    • http://nelliemaephotography.com/uploads/1/3/1/3/131384503/394518324a.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_off000090b0.bin
9a36184c8103bfb767c94eab53e8983ddfbc74540c077068fa18f2ca2d764b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90B0 9036 bytes

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