Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ac7963b5e8c951…

MALICIOUS

PDF

43.0 KB Created: 2020-04-08 09:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f5b239f760fd154dcc90b5f9f242aed1 SHA-1: 8f9b67138ac3c248258f42ca1a9d2e1215276446 SHA-256: 38ac7963b5e8c9513262310c124993eadc1f26d0fba2364c9a553dfc68bae346
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents and an HTML page. The ML classifier also strongly indicated maliciousness. The document body contains text related to solving a Rubik's cube, which is likely a lure to disguise the malicious intent of directing users to a link farm. No scripts were extracted, but the primary attack pattern appears to be SEO manipulation or hosting malicious content via a large number of external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://joannebangs.org/uploads/1/3/0/2/130271111/130271111.html#how+to+solve+a+2x2+rubik%27s+cube+easy+method
    • http://aiqcboston.org/uploads/1/3/0/4/130436473/4161401.pdf
    • http://visionquestevents.com/uploads/1/3/0/7/130776504/bedib-mawibafugo-sozubizosave.pdf
    • http://unleashedatthecarltun.com/uploads/1/3/0/3/130323724/2101329.pdf
    • http://taylored.solutions/uploads/1/3/0/4/130488331/bunij.pdf
    • http://armando-zumaya.com/uploads/1/3/0/7/130775596/lupazuxiripe.pdf
    • http://qualitygoods2020.com/uploads/1/3/0/5/130540540/tijumuk.pdf
    • http://greatoceanroadtreehouse.com/uploads/1/3/0/8/130813510/6284383.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_off00007d2e.bin
6b1b62ec2507861a6be5a3168bd9cbe7c0fb16002fa226fc91ad357eda435f49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2E 8260 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.