Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0d4ffbdd924b3b…

MALICIOUS

PDF

44.8 KB Created: 2021-06-09 08:13:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4b7a50f84fac3abd42e664a3ffde5704 SHA-1: 9839a9df1da8756675e90bb43d2724fdc75848ee SHA-256: dc0d4ffbdd924b3be827570ab12621af917b0b1db969dfbf82774cf2d6e19e5c
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-hack-a-roblox-account-with-brutus-game-hack PDF link annotation
    • https://www.nara.org.uk/uploads/files/files/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/roblox-online-free_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/freecoins_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • https://www.nara.org.uk/uploads/files/files/free-robux-offers_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
stream_004_off00005127.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5127 24656 bytes
SHA-256: 45927f68d776c490f8b1a5c4e097442d477108351f915a58edfe25e37a786f37
font_01_sfnt_off000089fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FD 19076 bytes
SHA-256: 496f970f6062c160c7c886c10ab350c47208de99edb9fdba4e5bdfb7131c3bd4

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