Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d31d926748aeed9…

MALICIOUS

PDF

55.6 KB Created: 2020-04-13 00:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2cb689bd2de37994b0cc5614daf19688 SHA-1: 7724b1a6e8680949fe2c6236e72b7d17de6f821b SHA-256: 2d31d926748aeed915d57fffad498dd524e2945c67d4993cc03799cba4403cfd
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that aligns with the detected link farm behavior. The primary function appears to be acting as a gateway to other malicious or SEO-abused content.

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://reconnecting-families.com/uploads/1/3/0/5/130551130/130551130.html#asus+m5a99fx+pro+r2.0+review
    • http://lgbaonline.org/uploads/1/3/0/6/130604993/geligamom.pdf
    • http://stonefoxfeather.com/uploads/1/3/0/9/130969852/1460195.pdf
    • http://cheyenne-nailsandbeauty.ch/uploads/1/3/0/8/130814966/gotuwabo.pdf
    • http://clayfieldmusicstudio.com/uploads/1/3/0/4/130483864/mevefajugaza.pdf
    • http://wise-think.com/uploads/1/3/0/5/130539757/e0745cb3.pdf
    • http://brownvalveautomationsystems.com/uploads/1/3/1/3/131380725/lopemawezizibif.pdf
    • http://alpineridgestudio.com/uploads/1/3/0/7/130776727/b2121.pdf
    • http://wellmaybllc.com/uploads/1/3/1/3/131383512/giwimopup.pdf
    • http://nordbygdahandball.no/uploads/1/3/0/2/130291536/nesejo_fikadedaze.pdf
    • http://myaceinc.com/uploads/1/3/0/2/130287808/03c7c5.pdf
    • http://venuswisdomschool.com/uploads/1/3/0/4/130488615/jakipikalofoxidu.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_off0000afff.bin
456016e01dc6457610a2ab8c7e24e95ce333d09bed8d8052042dbf10f619c731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFF 9152 bytes

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