Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e7f237b9756d9c…

MALICIOUS

PDF

31.2 KB Created: 2021-06-03 10:05:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 66321d7d2471b497ab31e607d1a328f1 SHA-1: d6bf13648412dcd47d2286fbe87e078301d7056d SHA-256: 83e7f237b9756d9c1f6c13b0d5a7869f51f1f120fccfe9ad0aab316d50e7f2f6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains links designed to lure users into clicking on them by promising game hacks and free currency. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or downloads. The ML classifier strongly indicated maliciousness, and the heuristics confirm the use of redirector links for deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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.
  • 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/406889139/coin-master-hack-spins-android-game-hack In PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/hack-master-coin-pc_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/real-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/wurst-hacks_GM479516143.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004c84.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C84 24132 bytes
SHA-256: b805837f35b16ee3b65e5d8e591a0740f10cb18ee003424bf4f14d63fb768e88

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