Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaaf784c60cf5fe3…

MALICIOUS

PDF

47.3 KB Created: 2020-05-24 14:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34c52541b0bbf164d6bf98bfa1b1afe3 SHA-1: 2cc32f27585d8e673d53a7beb7ee4394d7922838 SHA-256: aaaf784c60cf5fe37fc100b38341334f40851e8d7557133377210ed8681d8333
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. The document body contains garbled text and URLs, reinforcing the idea that the primary function is to redirect users to external sites, potentially for further malicious activity or to serve ads. No scripts were extracted from this sample.

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://claremontboxing.com/uploads/1/3/0/5/130551063/130551063.html#behen+hogi+teri+movie
    • http://philadelphiawaxing.com/uploads/1/3/0/6/130620869/2501402.pdf
    • http://thebeautycafemelrose.com/uploads/1/3/0/5/130541133/5445004.pdf
    • http://realestatephotographertampabay.com/uploads/1/3/0/2/130289553/rogiw-fifora-duwasodimub.pdf
    • http://westgatefleamarket.com/uploads/1/3/0/6/130603917/8113879.pdf
    • http://nolopiu.it/uploads/1/3/0/2/130272344/lukolilumiditet-pisum-gebir.pdf
    • http://splatteredinkwestland.org/uploads/1/3/0/2/130270932/latukegin_pexowotewi_bawuzaxag.pdf
    • http://queenofthewaves.net/uploads/1/3/0/7/130739811/rewemibovosug-sanapogufulu-mujemuneboge.pdf
    • http://marcbissonnettemode.com/uploads/1/3/1/3/131383429/a7b69d238ed4.pdf
    • http://littleragquilt.com/uploads/1/3/0/4/130483623/6848521.pdf
    • http://bellacanineconstruction.com/uploads/1/3/1/4/131438296/4ade7edfe3.pdf
    • http://alfafencing.net/uploads/1/3/0/6/130639244/7754584.pdf
    • http://bgatpmp.com/uploads/1/3/0/8/130874501/jifewujamoj-zapobevorexew.pdf
    • http://coralcoastbookkeeping.net/uploads/1/3/0/6/130621287/nimemagodoxax.pdf
    • http://velping.com/uploads/1/3/0/8/130815097/luxodepegijisega.pdf
    • http://imagea1.com/uploads/1/3/0/6/130604512/gofapiv_fisisa_wixow.pdf
    • http://6106829.xyz/uploads/1/3/0/3/130323675/jowada-waberi-zufolofom.pdf
    • http://lavenderskiesva.com/uploads/1/3/1/4/131453720/9470446.pdf
    • http://emyhill.com/uploads/1/3/0/3/130313524/a28eb63.pdf
    • http://953289857121631042.com/uploads/1/3/0/3/130323513/nadex-kubalowizebujud-nesusew.pdf
    • http://molexastucco.com/uploads/1/3/0/6/130639891/62d14fb7b9386cc.pdf
    • http://lawent.net/uploads/1/3/1/1/131164402/tifixupoxu-gogazutebo-xuvado-tikugevo.pdf
    • http://merchandizingmagic.com/uploads/1/3/1/8/131856314/365252.pdf
    • http://hopewithstacy.com/uploads/1/3/0/3/130312919/guxazu.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_off0000762e.bin
2fa96297fe9193b6adf5dbc15f1c2915e47e8658a375de18855847e05270dc9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762E 10952 bytes
font_01_sfnt_off00009c12.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C12 16164 bytes

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