Malicious PDF — malware analysis report

Static analysis result for SHA-256 8afc862b25192e12…

MALICIOUS

PDF

46.2 KB Created: 2021-05-12 07:34:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 19e00dad46fb2548cdf7650a16c4f4c0 SHA-1: b1de2186cbf47149828945ccc58ab086235b954e SHA-256: 8afc862b25192e122d544fad4deaab64ec385f302407a7f64d2167029633e9f1
222 Risk Score

Malware Insights

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

The PDF document uses a lure related to free game accounts and currency, impersonating brands like Microsoft to trick users into clicking malicious links. The document body and heuristics indicate a strong intent to redirect users to external sites, likely for credential harvesting or to download further malicious content. No scripts were extracted, but the presence of multiple malicious URLs and lures suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9278

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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.xyz/app/431946152/free-roblox-accounts-2021-with-robux-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
  • 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/free-roblox-accounts-2021-with-robux-game-hack PDF link annotation
    • https://repository.umgo.ac.id/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/daily-free-spins_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/robux-today_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-robux-scams_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_off00004aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA6 24644 bytes
SHA-256: 42f0aa1a9b348c09f305b198a9649f9b9a08472e2896e6b165ec537a2385f5db
font_01_sfnt_off000082b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B0 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off00008fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD7 19076 bytes
SHA-256: a3899638bf51e335cbc40673d1471e0832e9a39f88469ef4ed0809ba61e6f618

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