Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5c9a42fc209466…

MALICIOUS

PDF

36.1 KB Created: 2021-07-03 23:46:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3d2417a45d94866277c48b3ecdacef89 SHA-1: 665e0e42dc6022c5a91acbaae71e64478ea2d74c SHA-256: cb5c9a42fc209466eef81a0dcbb67752e9cc411ad8b2beaf720ca0d26ad7ab44
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 0.9980

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 http://netcdn.tw/app/431946152/free-robux-just-enter-username-and-password-game-hack PDF link annotation
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/guest-666-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/how-to-hack-accounts-on-roblox-2021-october_GM431946152.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/toolbox-mod_GM479516143.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/roblox-hack-hand-grabbing-players_GM431946152.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/free-roblox-svg_GM431946152.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • https://elerning.ubkman1lampungtimur.com/__statics/gudangsoal/files/how-to-cheat-on-eviction-notice-roblox_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
font_00_sfnt_off000033c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33C8 22564 bytes
SHA-256: a62da7a9180ad26d8037ca2207ee92c9f45e5c3e94209769aacbbd989b6bb948
font_01_sfnt_off00006640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6640 19740 bytes
SHA-256: ca0dd26b0bef75d2603dd700b03ccf5a3b1662ca9f727b40bb5c9350a3d5659a

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