Malicious PDF — malware analysis report

Static analysis result for SHA-256 449675bf51769ff6…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 10:15:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2e9b5d083817b1f988502460c65d0cb3 SHA-1: bc0844a9fe220a896d79bf20d8f580fb0353e218 SHA-256: 449675bf51769ff64f187bb7f870411d6505a5ef15e5d4a54ada8bdc5071e0bf
240 Risk Score

Malware Insights

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

The PDF contains a lure for free Robux, impersonating Facebook and directing users to a malicious URL. The document body and heuristics indicate a phishing attempt, likely to steal credentials or deliver a second-stage payload. The embedded URL is a known malicious redirector, suggesting a high likelihood of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/how-to-get-robux-for-free-2021-game-hack.
  • 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
  • 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.online/app/431946152/how-to-get-robux-for-free-2021-game-hack In PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/moonactive-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005597.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5597 26236 bytes
SHA-256: 818aa680e92690ee11fc965c9e7d8841537398949a29dae92b76ee373e27816b
font_01_sfnt_off00008f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F79 18684 bytes
SHA-256: 65f445f0396e54760dd2a1edc1744209422bc48f29c35ea74a9bcb72e79f8b06

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