Malicious PDF — malware analysis report

Static analysis result for SHA-256 690abff32ded8624…

MALICIOUS

PDF

38.2 KB Created: 2020-06-14 02:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6258bf14ef0e7c0d4c8ec464de69fd0d SHA-1: c06b06d9dc174c7f4bbbd37a8081820e6763a737 SHA-256: 690abff32ded8624dcb37e3a906f2dd9ec765f25832dbcd435ccdd85bac5df3e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious link structure. No scripts were extracted, but the sheer volume of links suggests a malicious intent to drive traffic to potentially harmful 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://topxboxx.com/uploads/1/3/0/5/130545333/130545333.html#iktisada+giri%25C5%259F+kemal+y%25C4%25B1ld%25C4%25B1r%25C4%25B1m+pdf
    • http://koastalcompany.com/uploads/1/3/0/8/130874575/4150400.pdf
    • http://how2makelemonade.com/uploads/1/3/0/2/130292073/sofavebumume.pdf
    • http://74-123-77-178.mgwnet.com/uploads/1/3/0/4/130488833/naxobiwilibava-zorudi-witokoxeravimu-zufufuv.pdf
    • http://lostoakstudio.com/uploads/1/3/0/4/130488252/8958522.pdf
    • http://mstcjenkins.com/uploads/1/3/1/3/131383398/7305622.pdf
    • http://thomasdfisherphotography.com/uploads/1/3/1/6/131637043/puwubu-suvotagemekuki-vajed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bevixevekev.files.wordpress.com/2020/06/74706041378.pdf
    • https://xenexusese.files.wordpress.com/2020/06/latulorosizilajokip.pdf
    • https://samizoz.files.wordpress.com/2020/06/43210765743.pdf
    • https://lirajobavan.files.wordpress.com/2020/06/jidowavimedalubebelowaja.pdf
    • https://telomema.files.wordpress.com/2020/06/15412527311.pdf
    • https://pozudarade609401788.files.wordpress.com/2020/06/79879894230.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051c7.bin
321327987808363203eb5752a1573a6b6f708b91813b318ef4859a336dbcc54b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51C7 11476 bytes
font_01_sfnt_off000075df.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75DF 16204 bytes

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