Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e84bc27f57a7d7c…

MALICIOUS

PDF

44.7 KB Created: 2021-06-04 01:43:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 776f621cfc292d38b0398030525429c1 SHA-1: b3e1dc503ef30be587c1f2c00a12f10ad42141a3 SHA-256: 9e84bc27f57a7d7ca12bcb8f4214f49aa05f3f6d58ae7ccc9602b3a49d3379bd
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, disguised as game-related downloads. The ML classifier also flagged this PDF as malicious. The primary lure appears to be a 'free generator / game hack' for Minecraft, directing users to the malicious URL https://netcdn.online/app/479516143/minecraft-free-download-chromebook-game-hack. No scripts were extracted, but the PDF structure and embedded links indicate a social engineering attempt to redirect users to malicious sites.

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.online/app/479516143/minecraft-free-download-chromebook-game-hack In PDF document text
    • http://lib.kesdammedan.ac.id//repository/claim-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/websites-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/pubg-uc-purchase_GM1330123889.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/tiktok-free-98_GM835599320.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/www-rubux_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/tiktok-vs-free-fire_GM835599320.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://youtuIn 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_off000050fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FB 24716 bytes
SHA-256: 27b8780013ce33c6e60438efcd31fb496bf61e8a154a66aa6308b9a4af0ed2a8
font_01_sfnt_off000089e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E3 19044 bytes
SHA-256: 5dd9560c2144c6e0c163b4f028c4225137fae20b1a5cdfb52854f5b1068f3385

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