Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c7755bf56ba533…

MALICIOUS

PDF

39.2 KB Created: 2021-05-22 07:38:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eac193739dea3ddd719d095b392ee1a4 SHA-1: 9f552845fe0d51a63396742dcc5eac2922a51305 SHA-256: 81c7755bf56ba5330d4b5c1f9da3db5ca1047725a1adcf8ae7451ae31a6336c2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

Heuristics 4

  • 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.
  • 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/431946152/how-to-get-free-robux-without-verification-or-surveys-game-hack PDF link annotation
    • http://fv-freinsheim.de/images/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://fv-freinsheim.de/images/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://fv-freinsheim.de/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://fv-freinsheim.de/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://fv-freinsheim.de/images/free-robux-group_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3233 24404 bytes
SHA-256: 42ee081f544c4fc08b3d4edc0ed754a67b59453ae0fabe4fe139decdfaf25e5f
font_01_sfnt_off00006a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7A 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00007428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7428 19424 bytes
SHA-256: 30551668946d9b3d80fdd5a427c07e5f2c52faec585ae3c44dbbbd4d67cc7463

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