Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48fa7c3603ac502…

MALICIOUS

PDF

40.3 KB Created: 2020-04-12 08:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e16c4280969272cf9abbb5a2101b06b6 SHA-1: 1c8a3a40827eb4dd32e3179b936c06fe03d6c248 SHA-256: a48fa7c3603ac50298b4dde0acef01e341332aadeb002c05050bc06bafb9837c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO spam tactic. One of these links, http://misssupremepurityqueen.com/uploads/1/3/1/1/131164272/131164272.html#cat+5+cable+color-code+standard, is directly embedded and presented as content. The ML classifier strongly flagged this PDF as malicious. The presence of numerous SEO-optimized PDF links suggests an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://misssupremepurityqueen.com/uploads/1/3/1/1/131164272/131164272.html#cat+5+cable+color-code+standard
    • http://grupocedron.com/uploads/1/3/0/5/130539344/3387382.pdf
    • http://kirstycarrphotography.com/uploads/1/3/1/4/131437728/8984420.pdf
    • http://zaclavendercomposer.com/uploads/1/3/0/6/130620674/tubogilareda_pujovinaxoso_xesoralogaj_kukes.pdf
    • http://waialaekahalachapel.com/uploads/1/3/0/2/130270879/wobarogomovubog.pdf
    • http://onevoiceevolving.org/uploads/1/3/0/9/130969211/8380e50ecb71145.pdf
    • http://ammantower.com/uploads/1/3/0/6/130621648/6a2b3052fd4b20.pdf
    • http://enhancedvisionwindowguttercleaning.com/uploads/1/3/0/7/130774969/xaxavujejufu.pdf
    • http://gardenerandjohn.com/uploads/1/3/1/4/131438127/733eedfcaadb7.pdf
    • http://ammantower.com/uploads/1/3/0/6
    • 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_off00007548.bin
eed4534592ab088f4ebfc28c371c3554307580230a4ca547a01ac863bf442065		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7548 8420 bytes

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