Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b557e2b11b27427…

MALICIOUS

PDF

43.6 KB Created: 2021-05-19 22:03:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ae511ee5afc2f134fe7b2dd737bc376a SHA-1: b06df37a0af83d0440c2df00d41a08487292aded SHA-256: 3b557e2b11b274276aaaac0cb29d8b6433b2a1eb5e7b6b0cde57697c54ec283c
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 0.9969

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.xyz/app/406889139/links-to-get-free-coins-in-coin-master-game-hack PDF link annotation
    • https://library.stikesmi.ac.id/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-download-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/oprewards-login_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-get-robux-for-free-2021_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_003_off00004ada.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ADA 25976 bytes
SHA-256: 52cc577cfc2c9c24863fa38a5fe24258f6ddae6ffcbf1630224a06501d94f4eb
font_01_sfnt_off0000857c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x857C 19208 bytes
SHA-256: a0300e66755b98f089ef899711a9ad611ceecb9988b89ef54f8e217c45a85e28

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