Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d72dadfe6459ec1…

MALICIOUS

PDF

42.2 KB Created: 2020-03-06 16:18:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0e5af1fa49acdc6c5ca423938971a19c SHA-1: 2a205894eac9a782dfc57e419d89f5e5207ece89 SHA-256: 9d72dadfe6459ec1f70252de10269dac6fe9d4246b84968dd0ea5d6add89054d
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with the link farm behavior. The primary attack pattern appears to be SEO spam or a link farm designed to direct users to potentially malicious content hosted on numerous subdomains.

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://cvkhotel3.devsite-1.com/uploads/1/3/0/5/130551651/130551651.html#adobe+audition+1.5+video+tutorial
    • http://starseedsmovie.com/uploads/1/3/0/6/130621115/doxebepex.pdf
    • http://mabuto.net/uploads/1/3/0/5/130589302/sumodaf.pdf
    • http://www.okiepub.com/uploads/1/3/0/9/130969297/zixeludunegunuf.pdf
    • http://26thplaceflats.com/uploads/1/3/0/6/130604086/40c18d19e87d.pdf
    • http://yungpop.com/uploads/1/3/0/7/130776254/jujiw.pdf
    • http://honeyandserifs.com/uploads/1/3/0/2/130271206/jelobezokofibo.pdf
    • http://www.cosavantdesigns.com/uploads/1/3/0/5/130590719/8188732.pdf
    • http://onthetrotequine.net/uploads/1/3/0/4/130476541/8476954.pdf
    • http://www.tigerser.com/uploads/1/3/0/7/130776818/48fb91.pdf
    • http://nccsdk12.net/uploads/1/3/0/5/130539742/5996333.pdf
    • http://joemathewson.net/uploads/1/3/0/8/130814716/xexoka-piwosajuzizegu-lanumepi-kuxuwakujew.pdf
    • http://snowbirdhomemanagementservices.net/uploads/1/3/0/4/130435715/verajozikujopu.pdf
    • http://mycyberphile.com/uploads/1/3/0/2/130272350/fufaxevu.pdf
    • http://www.emmarobbinsphotography.com/uploads/1/3/0/5/130543740/c6611393ab4f336.pdf
    • http://mealsmakers.com/uploads/1/3/0/4/130483499/6d10187.pdf
    • http://noebrown.com/uploads/1/3/0/2/130288383/7237330.pdf
    • http://aylaspirityoga.com/uploads/1/3/0/2/130288603/9fb2c12bdbb31.pdf
    • http://tylerdsmith.org/uploads/1/3/0/4/130483443/pumikuxeritefef.pdf
    • http://molokaishores.info/uploads/1/3/0/8/130814874/5754379.pdf
    • http://radioteleunite.com/uploads/1/3/0/4/130477228/323584.pdf
    • http://wernickesfoundation.org/uploads/1/3/0/2/130287997/8552c94d.pdf
    • http://nyclegendsofstreetball.com/uploads/1/3/0/6/130639107/wupusowasakumuxude.pdf
    • http://snapshotsofwisdom.com/uploads/1/3/0/3/130324027/jozepezogup_gatopini_zuzilinas_fuburigo.pdf
    • http://lemoulinetcollection.com/uploads/1/3/0/8/130873987/7400044.pdf
    • http://mail.purelifealliance.com/uploads/1/3/0/7/130775527/6967064.pdf
    • http://mail.purelifea
    • 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_off000079e4.bin
75c05974b22200aa00e8a1a3efb6c81943fe3e7ecc585adeb1f7b8aa4301056a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E4 8772 bytes

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