Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c5879ff4a18695…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 14:39:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7d26c660249b64468f89d86ead795b2c SHA-1: 4b3c5510dab082145ac3d5c49c86de0d327e85c6 SHA-256: d2c5879ff4a18695d4e6b5caee10f6be98a48bf7253a7f86775989f8447d95fa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links and text that explicitly promote 'free generator / game hack' lures, specifically mentioning 'Coin Master' and 'Roblox'. The primary URL identified, http://netcdn.tw/app/406889139/60-free-spins-coin-master-game-hack, is flagged as a malicious redirector. This suggests the document's purpose is to trick users into visiting this URL, likely leading to further malicious content or exploits.

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/406889139/60-free-spins-coin-master-game-hack In PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/roblox-bandit-simulator-hacker-crate_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/cheat-codes-for-roblox-ultimate-driving_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/roblox-bloxburg-free-bs_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/mythical-world-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/free-robux-pin-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/coin-master-ad_GM406889139.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/how-to-get-a-free-dominus-hat-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/download-kranberry-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/comment-hacker-dans-roblox-pc_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/roblox-build-your-dreams-hack_GM431946152.pdfIn PDF document text
    • https://www.ashkarco.com/uploaded_files/userfiles/files/roblox-anti-hack-saving_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_off000030f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30F3 23288 bytes
SHA-256: 1a6b4072b0a61be6152f97236730cedcc353d6b3f40f5839261d8182a2b3f02d
font_01_sfnt_off0000657a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657A 18516 bytes
SHA-256: 9c110acbe1bdea99191041174f21e13522cf76b2385bd88ae7104caf738e615a

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