Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dd087b1800ac30…

MALICIOUS

PDF

37.1 KB Created: 2021-05-10 11:03:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 49bdac43e3d42fe9c4144e66e216fa9b SHA-1: 0f01062f33eb5cbc553188a14694488c10d69f78 SHA-256: 51dd087b1800ac30d6060fd236d03b8adca789ae53868f74ee999366b8acffa0
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains lures for game hacks and free spins, directing users to a malicious IP address. The presence of a 'download button' heuristic and the redirection to a URL hosted on an IP address suggest an attempt to trick the user into downloading a second-stage payload. The document's structure and embedded links indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0460

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://netcdn.xyz/app/406889139/coin-master-free-spins-link-blogspot-game-hack PDF link annotation
    • http://36.67.39.239:8080/__statics/gudangsoal/files/free-robux-for-kids-no-verification_GM431946152.pdfPDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000035fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35FA 24648 bytes
SHA-256: f2abc63df0af91eaba58bc680d84d594162e4b4bec505a082396e29d068b8148
font_01_sfnt_off00006e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E76 18632 bytes
SHA-256: bdbf3986ec68ee3b496ae89412d1d0f392e3b826f1ca321ec58289079c9e4546

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