Malicious PDF — malware analysis report

Static analysis result for SHA-256 289316a0d325a5b4…

MALICIOUS

PDF

53.8 KB Created: 2021-06-03 11:42:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 069faee7909254ac0a6e7fff888ea965 SHA-1: 2262c6bed258ec014ec20610f14f2018e93bbcf5 SHA-256: 289316a0d325a5b43394deadc415ae8ad5f7afdf42a98f33a9e99db9c6dd7e91
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 0.9491

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/free-robux-glitch-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
  • 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/free-robux-glitch-2021-game-hack PDF link annotation
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/dayz-2-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-cheat_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005355.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5355 27828 bytes
SHA-256: 55c77ca9eb70c4549c5579df3387e6584a2d629cce1ebcbef5dea9db6dd42066
font_01_sfnt_off000093b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B6 3992 bytes
SHA-256: ca9cd4f0345d8483bda3e807ea4e40142b8bf70d3672af2d6a5dd7953d1a2391
font_02_sfnt_off0000a0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0D8 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000adea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEA 18880 bytes
SHA-256: e0b2f5218feb7ccbc61643c87456d5d0b0f9dddc4acedfb65bbbea4baf30e52d

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