Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0cb76ffb7acea2…

MALICIOUS

PDF

33.4 KB Created: 2021-07-09 19:10:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e846ed7425da8a8cb0d7b592b10f0189 SHA-1: 7f64a0b1e354d6f23867403f944c597c6962687b SHA-256: 3b0cb76ffb7acea28cced2c8c6ee7e80ae758712558b20140e7ef9a5ff420668
160 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free coins'. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-coins-game-hack, which is flagged as a known malicious redirector. The document body and heuristics indicate a social engineering tactic to trick users into clicking these links, likely leading to further malware downloads or phishing attempts.

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/coin-master-free-coins-game-hack In PDF document text
    • https://vierabyragazze.com/upload/files/roblox-jailbreak-hack-safe_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-field-of-battle-gold-hack-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-hack-ios-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/i-hacked-yogssmacky21-on-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/robux-hacks-code-admin-commands_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-34-4-hack_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/veorra-set-free-roblox-id_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/follow4follow-free-followers-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-for-roblox-cheats-and-guide-app_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002f18.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F18 22308 bytes
SHA-256: bb003fbd5442de6b0dd306fe127e41ca0428b804d4f44025bbe9538a5ac206b9
font_01_sfnt_off000060a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A8 17996 bytes
SHA-256: 2ec206c530faa3d40eac36f14655b3e9b935e9ff12c648634e177d5bc9421463

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