Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccfe0dffbd28acb6…

MALICIOUS

PDF

32.5 KB Created: 2020-04-06 06:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 259fc91b1221b9507d005a3b17885f35 SHA-1: d6058c16d0be966d0d4138ad0236ba1d11f538cf SHA-256: ccfe0dffbd28acb651345362e3a504deef7eb2884ea2df1f9a1af98c27088c3f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be to create a link farm, potentially for SEO manipulation or to distribute further malicious content through the linked PDFs.

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://krissyoneill.com/uploads/1/3/0/6/130604700/130604700.html#bristol+board+of+education+bristol+ct
    • http://skgelectrical.co.uk/uploads/1/3/1/4/131408913/liperebiseniluj_kididanutokiva_rebixipef.pdf
    • http://tneducatorsconnect.org/uploads/1/3/1/0/131069961/pomosiw_demuzubigadax_suwokodavoxej_xulekek.pdf
    • http://creedompublishing.com/uploads/1/3/0/5/130551925/kifok.pdf
    • http://caseycorp.biz/uploads/1/3/0/4/130488759/c79b28094.pdf
    • http://thesalondinner.com/uploads/1/3/0/8/130815437/nifamenadafutu_linefotev.pdf
    • http://price-laboratory.com/uploads/1/3/0/3/130312957/kuvoxigakumifidiwa.pdf
    • http://clonmeltuitionacademy.com/uploads/1/3/0/7/130739742/5386744.pdf
    • http://akidstuition.com/uploads/1/3/1/4/131437377/vofazevupakiji-sapatovikuwor.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_off0000555b.bin
cea631106758391fa3375fcba0614bbc58a22d1b89f8f728d4cb1f504a8f0d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x555B 7740 bytes

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