Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c06a69cd0fbce93…

MALICIOUS

PDF

44.7 KB Created: 2021-06-08 23:00:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 54dc40f47000c506f159cebc83322100 SHA-1: dcc431ebdfb21f3ccab38ffedecad0d6e2455590 SHA-256: 4c06a69cd0fbce933f733761706b1c2efe0b7a4bad4427aba297f7886b7f640c
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, specifically advertising "game hacks" and "free generators" to lure users. The primary malicious URL identified is https://netcdn.tw/app/431946152/cookies-roblox-hack-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector designed to exploit user interest in free items or cheats, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/cookies-roblox-hack-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pubg-uc-generator-2021_GM1330123889.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/google-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coins-on-coin-master-generator_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_off0000512a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x512A 25152 bytes
SHA-256: 130368e65e165637faf8b92a9787b277be4d459f5ff92f0e3577ae49bfcb99b6
font_01_sfnt_off00008bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDA 18300 bytes
SHA-256: a503456b7efba7ebb025256484f85103b6071334007ccdcc351750e8d2be40b7

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