Malicious PDF — malware analysis report

Static analysis result for SHA-256 9562b2a727409cbc…

MALICIOUS

PDF

49.0 KB Created: 2021-06-11 10:34:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c4e5174c1ddf37d5d9531ccc5558c2c4 SHA-1: 66122af4bf918a4911112b46d0693ab7f6ef1110 SHA-256: 9562b2a727409cbc63c1acb0913f9d6c0ef5cf3d9e80732d1cda56cfad06b23e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and free generators. The primary link identified, https://netcdn.tw/app/431946152/how-to-earn-free-robux-on-roblox-game-hack, is flagged as malicious. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/how-to-earn-free-robux-on-roblox-game-hack In PDF document text
    • https://repository.stikesindramayu.ac.id/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/cheat-roblox-tire-dans-les-mur-sur-phantom-forces_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/somebody-hacked-my-roblox-account-prestonplayz_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-hack-someone-for-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005433.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5433 25436 bytes
SHA-256: ce3b648b3a0c8f1085d8523cafb99dbcc2f74c7d8236afd6e980eb36fc4b31be
font_01_sfnt_off00008f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F10 3988 bytes
SHA-256: 567b12258042b29dc9213b211e31194e9e0e96b59e87b0fcdaf4835989646dee
font_02_sfnt_off00009c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C2F 18480 bytes
SHA-256: 3f16402f4c8f61fc422d8df79a7fca2b723c34418d35e4d4c4823d9abb369543

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