Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5ba623e9b06a08…

MALICIOUS

PDF

50.8 KB Created: 2021-06-04 00:55:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 175121f898e6af872b22e693a4a7f39a SHA-1: 70dbe4e852197b362c0a6301c44319ccd3ff3512 SHA-256: cc5ba623e9b06a08be9d27245b5e39e42725aa7ce6bd22e223827f4288cb3673
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9779

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.
  • 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/who-hacked-cuteluccy9-on-roblox-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.online/app/431946152/who-hacked-cuteluccy9-on-roblox-game-hack PDF link annotation
    • http://perpus.stmik-im.ac.id/repository/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/abd-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/pubg-uc-buy-in-pakistan-jazz-cash_GM1330123889.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-place_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-unlimited-spin-and-coin-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-jailbreak-hack_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
stream_004_off00005bc1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5BC1 26236 bytes
SHA-256: 9c32aeeba58e9abc738022e9dc66bd6dfbe8a12eab8ea6c7ad8fe214a005704b
font_01_sfnt_off000096a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96A3 2908 bytes
SHA-256: 5879c26d32e0ab4faed3d680263fa74cc266a38abde1d6ee4d56808f786447fc
font_02_sfnt_off0000a09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA09D 19308 bytes
SHA-256: 2d3af7b79ec74664988fa46d52be649353dbe99995fb3001913c236e5449ad3f

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