Malicious PDF — malware analysis report

Static analysis result for SHA-256 3062cdc7492d72a3…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 20:44:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a3397fdabf0aa2e3c10230fc8ef44671 SHA-1: b67381269e6ee5f23cc8a4dd885585759370ba65 SHA-256: 3062cdc7492d72a3a13e8dca2d22c82b52f061a2d638a7740dba98f04b388d7f
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/coin-master-free-spins-that-really-game-hack. This redirector is likely used to deliver a second-stage payload or lead the user to a phishing site. The document body and embedded URLs suggest a lure related to game hacks and free currency, a common social engineering tactic. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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-spins-that-really-game-hack In PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-hack-in-eviction-roblox_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/free-robux-hack-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/free-robux-tips_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/wurst-client_GM479516143.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-get-free-robux-without-paying-any-money_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/free-robux-games-on-the-top-page_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/daily-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/boku-no-roblox-hacked_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-get-robux-free-on-pc_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/roblox-hacks-hack-de-robux_GM431946152.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-get-free-roblox-102-that-works_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_off0000338f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x338F 22908 bytes
SHA-256: 1d62c66b27daa9022ca0f3fc5b3b65eb14153f06b6d87c9c891a287bb68f43e7
font_01_sfnt_off0000670c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x670C 18592 bytes
SHA-256: 6ce224978adda1273fbe859cfaaf113315cbbc733c62935cb77f5f7075e1d2c6

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