Malicious PDF — malware analysis report

Static analysis result for SHA-256 9864cf14a3057ace…

MALICIOUS

PDF

45.3 KB Created: 2020-04-23 10:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db980e3c1e1923399c4d8219e313d814 SHA-1: 268819d042144ef3b5ceaa1079db24223109db1c SHA-256: 9864cf14a3057ace38a9291d26a4612001d53ceb0e9191a91a0d8d0fd59e299e
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique commonly used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'Bohemian rhapsody movie imdb parents guide', suggesting a lure to attract clicks. The primary attack pattern involves a link farm designed to drive traffic to various PDF documents hosted on different domains.

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://overlays.us/uploads/1/3/1/4/131453397/131453397.html#bohemian+rhapsody+movie+imdb+parents+guide
    • http://greatergoodsteam.com/uploads/1/3/0/6/130604877/1017169.pdf
    • http://greenscapeventures.com/uploads/1/3/0/7/130740151/jijofabewekodoma.pdf
    • http://londonreviewbank.com/uploads/1/3/0/6/130640081/mupiwimomiwusitebo.pdf
    • http://ifitswalkedonllc.com/uploads/1/3/0/6/130621053/kigijepefube_ganujobosewi.pdf
    • http://cro-consulting.com/uploads/1/3/1/6/131606494/kaxolidijupu-lisonelutovoro-vunibanase-togiwowireziwag.pdf
    • http://muslyr.net/uploads/1/3/0/5/130588575/varumedasidako-soveniporulas.pdf
    • http://dotexamsnowcom.com/uploads/1/3/0/7/130739811/dalomiximonexoreja.pdf
    • http://corptech.club/uploads/1/3/0/9/130969496/5940615.pdf
    • http://opiekawdomuipodrozy.eu/uploads/1/3/1/6/131637113/risaler-sigosibesit.pdf
    • http://buildingblocksfitnessllc.com/uploads/1/3/0/7/130775603/sujofis.pdf
    • http://alfredrosenberg.org/uploads/1/3/0/7/130775831/2099920.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dbc.bin
78aa305e042b28019632b81c61065658ae3d1b740fce289d0c6f09b54f54c290		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBC 8852 bytes
font_01_sfnt_off00009f4d.bin
83d89f79375f7f339e88070a8779324ce221c94923bff415e388e162fbc46cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F4D 2604 bytes

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