Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7eacea90dd491c4…

MALICIOUS

PDF

45.1 KB Created: 2021-06-10 18:29:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e78101b44801d0d0dfefe25d7d0bac1b SHA-1: 2272f174950d45f8264c4a72d0b7b943bf22aba6 SHA-256: a7eacea90dd491c49bcfbc1846d24cd71dc258a1126a50cfbb4f070662318929
142 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 a seed-phrase/secret-recovery lure. 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 0.9865

Heuristics 5

  • 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.
  • 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.tw/app/431946152/how-to-earn-free-robux-on-roblox-game-hack PDF link annotation
    • https://gryps.de/images/free-robux-generator-hack-2021_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/coin-master-hack-ios-10_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/claim-free-robux_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://gryps.de/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://gryps.de/images/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • https://gryps.de/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://gryps.de/images/free-texture-packs-for-minecraft-pe_GM479516143.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_off000051f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F7 25656 bytes
SHA-256: c85c5bf102ad1713a663ce9f65c863dad241de4670005e4d353f438302668119
font_01_sfnt_off00008cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF2 18480 bytes
SHA-256: 3f16402f4c8f61fc422d8df79a7fca2b723c34418d35e4d4c4823d9abb369543

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