Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce55daae3a12710…

MALICIOUS

PDF

56.1 KB Created: 2020-04-06 08:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 12076053a028abbc70a11332da728e87 SHA-1: bc6cb5756846e6beb739d4c2cb6152a3b9c70e34 SHA-256: 3ce55daae3a127101281c6cdeec5283436be22421152ce0c41f60477a76b34a3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution network. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to these external resources, which could host further malicious content or be used for SEO manipulation.

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://cindystabile.com/uploads/1/3/0/7/130775592/130775592.html#2nd+grade+common+core+math+worksheets+answers
    • http://ainsaja.org/uploads/1/3/0/7/130740357/juvogetaduvoluw.pdf
    • http://googledrugs.org/uploads/1/3/1/4/131407324/fijagix.pdf
    • http://darenbrayson.com/uploads/1/3/0/8/130814761/a1435379e3.pdf
    • http://quartzbeautybar.com/uploads/1/3/0/5/130588702/7033446.pdf
    • http://empressnco.com/uploads/1/3/1/4/131410479/xabotevuni-remubipa-fuful.pdf
    • http://mtbsiteservicesbusiness.com/uploads/1/3/0/2/130289254/87dbe6db7b.pdf
    • http://buzzbelly.blog/uploads/1/3/0/6/130639085/xawox.pdf
    • http://usrxpro.com/uploads/1/3/1/0/131070567/botiburewuriw-jolebefutoze-lifatusugivisu-bivazuputadu.pdf
    • http://dandglettings.com/uploads/1/3/0/7/130740393/114aa335.pdf
    • http://hsv-eraser-reviews.com/uploads/1/3/1/4/131453268/xexog-zakerotid-jatetovogen.pdf
    • http://globalnaturalllc.com/uploads/1/3/0/5/130588795/9777524.pdf
    • http://sashflora.com/uploads/1/3/0/6/130605153/12ea9c7.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_off0000b204.bin
d0952d548896b56bb0ff24a3001c9012c11279ec9c58c1dd37ecfbd15a39558b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB204 8588 bytes

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