Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2b5d7d42898177…

MALICIOUS

PDF

40.1 KB Created: 2020-04-15 03:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 290722b31f3d7cc04741cb0ea7b2a711 SHA-1: 403ee6cbbba9cff9a33dd292f7b844883e5cf34d SHA-256: 8d2b5d7d428981776f14f7bb983a221e5140793cbc826177f28a844fb24c45d8
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam tactic. The document body, though partially corrupted, contains text related to 'Mortal Kombat x kotal kahn guide' and 'wkhtmltopdf', indicating a lure to potentially malicious or unwanted content. The ML classifier strongly flagged this PDF as malicious.

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://kaphammeraustin.com/uploads/1/3/0/6/130621366/130621366.html#mortal+kombat+x+kotal+kahn+guide
    • http://allanparachinicustomfurniturekauai.com/uploads/1/3/0/2/130272275/pusilo.pdf
    • http://charlottesangels.net/uploads/1/3/1/3/131379830/9806943.pdf
    • http://multiskim-plastering.com/uploads/1/3/0/7/130775902/tomelupigokes_zutabud.pdf
    • http://philliprodriguez.net/uploads/1/3/0/4/130490399/dadaris.pdf
    • http://leievenn.com/uploads/1/3/0/4/130483350/rovigezope.pdf
    • http://high5digitalvideo.com/uploads/1/3/0/4/130488506/gibalov_pogogu_zisopopil.pdf
    • http://djeduardoalves.com/uploads/1/3/1/4/131410479/rujudawimame_nasavamines_junimirijoji_nafutes.pdf
    • http://olympiacos.online/uploads/1/3/1/0/131070196/narisawipelesafi.pdf
    • http://johnvthephotographer.online/uploads/1/3/1/4/131438129/06e2e0e61aed9f.pdf
    • http://multiskim-plastering.com/uploads/1/3/0/7/130775902/tomel
    • 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_off00007523.bin
8abfe5cd1e2914d6a22edaf7cbe47c9cc423eaa96ecc616ac0c63f2504d86b1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7523 8148 bytes

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