Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd9a8459e67df50…

MALICIOUS

PDF

45.1 KB Created: 2020-04-11 09:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3901084c8d7ea2e8ba09429c5802af15 SHA-1: e121510ec9a6a165c5ecfb24c82146540fd493a3 SHA-256: ffd9a8459e67df50240d4c2aebd494b361ee13bfcce81501305558e8971c5637
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to similarly structured URLs on unrelated domains, indicating a link farm for SEO manipulation or traffic redirection. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'Oedipus rex study guide answers quizlet'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://rehphotography.org/uploads/1/3/1/3/131384636/131384636.html#oedipus+rex+study+guide+answers+quizlet
    • http://tampabayplasticsurgery.net/uploads/1/3/0/3/130323707/a7b8ae.pdf
    • http://isthisproblematic.org/uploads/1/3/0/4/130478174/dumoligab_zefogewusoji_baxefoda_taperalosezetu.pdf
    • http://fineoriginalartwork.com/uploads/1/3/0/8/130814401/vemabu.pdf
    • http://mackyjoss.com/uploads/1/3/0/2/130291572/6700618.pdf
    • http://jfjapparel.com/uploads/1/3/1/4/131438775/97347b3fab12.pdf
    • http://alturaenviromental.com/uploads/1/3/0/8/130813616/lefemi.pdf
    • http://futureplastics.net/uploads/1/3/0/5/130540172/miguxugo.pdf
    • http://cruzinwithdabluez.com/uploads/1/3/1/3/131397964/9267901.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_off00008955.bin
ebd8db0d404b739d852df2f07f659161cf7ed53f73a9f773838150dde86c95dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8955 8108 bytes

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