Malicious PDF — malware analysis report

Static analysis result for SHA-256 3948fa007b24cdc9…

MALICIOUS

PDF

35.6 KB Created: 2021-07-06 18:21:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 11766217afdaff5d4400749b9513835b SHA-1: b03d30a17fae56c611ef28c6c21c2b5cb208d064 SHA-256: 3948fa007b24cdc90de62e65310be03ac37461dacb4386cee6566fdff041c949
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games. The document body and heuristics indicate a lure designed to trick users into clicking these links, likely leading to further malicious content or downloads. No scripts were extracted, but the primary attack vector is the malicious URL embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-20-free-spins-link-2021-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/earn-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-prevent-your-roblox-account-from-being-hacked_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-hack-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-free-clothes-template_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/dragon-ball-z-rage-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hack-tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-free-gamepasses-script_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-stickmasterluke_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-codes-november-15th-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-pastebin-no-save_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/today-on-roblox-we-will-be-hacking-scootch202156_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/heroes-online-roblox_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_002_off0000328b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328B 23316 bytes
SHA-256: 18bbf35d0e94e295a95464c724d4eb81bfe327cf16c75bb3eca9f4d45f5cc093
font_01_sfnt_off000066ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EA 18748 bytes
SHA-256: 2fa519299f8a2165e5faef35be9d47acb7f717a213bb0fe22b3fbdc2136af6a5

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