Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bad1d5d9f88d0e3…

MALICIOUS

PDF

45.6 KB Created: 2021-06-11 10:24:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7a40335339f9248d45a3c138c309bd83 SHA-1: 0df13ccbc0a1a84781c767675876baa50c4f2068 SHA-256: 3bad1d5d9f88d0e3543141e8990cd684afb6f4277a4a0ab5593e58b7d104ebed
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure related to game hacks and generators, impersonating brands like Paypal to entice users. It contains multiple links to redirector infrastructure, such as `https://netcdn.tw/app/431946152/cheat-codes-for-theme-park-tycoon-on-roblox-game-hack`, which likely lead to phishing or malware distribution sites. The ML classifier also flagged this document as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.tw/app/431946152/cheat-codes-for-theme-park-tycoon-on-roblox-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
  • 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/cheat-codes-for-theme-park-tycoon-on-roblox-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-hack-script-pack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/como-tener-dinero-infinito-en-jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/delta-roblox-hack-buy_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-toy-codes-list-free_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-cards-free_GM406889139.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_off00004ee3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EE3 27316 bytes
SHA-256: aa9cfff22593a6961e2422bd1c94b54ba1525a25a98e1d020dfc183eb67ace65
font_01_sfnt_off00008c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C92 19384 bytes
SHA-256: 1be12cb389fc7eb4b9221b24341602d1b09a4755741a29361da9bb5e9ed68c9d

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