Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ca3cc698cdfd79…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 13:17:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 820fa724c7b8599ef02c24a55157f374 SHA-1: 0fb8fffb9ea3b0236bdd851b4eb365ab221f0885 SHA-256: e5ca3cc698cdfd797cdf77879e70616d76897f0b88a7f68d05147d8d03405a1e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/roblox-apk-hack-game-hack, which is presented as a lure for game hacks. The document body and heuristics indicate a social engineering tactic to trick users into clicking these links. The embedded URLs likely lead to further malicious content or malware downloads.

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/431946152/roblox-apk-hack-game-hack In PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/roblox-admin-commands-free_GM431946152.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-coin_GM406889139.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-hack-apk-35-33_GM406889139.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/robux-hack_GM431946152.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coinmaster_GM406889139.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-robux-giver_GM431946152.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/wall-hack-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/how-to-make-a-roblox-hack-with-lua_GM431946152.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://www.indokashcrafts.com/uploaded_files/userfiles/files/free-roblox-hats-3_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_off00003181.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3181 22892 bytes
SHA-256: 4631a56dd6b35821131c89d55cbac4e77945ddd2eda073a71a838706fb2e7b27
font_01_sfnt_off00006430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6430 18832 bytes
SHA-256: 4a54e3c0999d22341ed87b7a4ab614cdfd6f3715e6a9eb51b324e9e7408846b1

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