Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1c1033a7dc2a68…

MALICIOUS

PDF

46.8 KB Created: 2021-05-14 15:11:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3756f046fb878c4aa770448ce52c3cba SHA-1: ebf4ecc704f9f3a4205237a902ac2bc98ca8cec6 SHA-256: 5b1c1033a7dc2a68ed089e9460be159144f049c563fd0a3a0dbce698e223b2a3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to known malicious redirector infrastructure, specifically promoting "free generator / game hack" lures. The primary link directs users to `https://netcdn.xyz/app/406889139/where-can-i-get-free-spins-for-coin-master-game-hack`, which is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/406889139/where-can-i-get-free-spins-for-coin-master-game-hack In PDF document text
    • https://www.gymun.cz/images/minecraft-com-free_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/roblox-hacks-and-cheats_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_003_off00004a65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A65 32388 bytes
SHA-256: c17ea98798888145751dd93cfe5ae2122992b300c179808cc1eb41d0ded2a983
font_01_sfnt_off00008afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFE 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000094b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94B0 18248 bytes
SHA-256: 8779a24c74e66c23b33121dd1a71955adfc2f322ab09b0870da4a74651533123

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