Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdaf1c4732d5bb39…

MALICIOUS

PDF

42.2 KB Created: 2021-05-20 00:41:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0ecdfe5325747f48a00fbb3e05b5a54a SHA-1: 6b10ad11ad27cc7961b74b83264b22f5c6947710 SHA-256: cdaf1c4732d5bb39c2e0241aea86d0243db5f1894434406875d437c046deb0e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The heuristic firings indicate these links are part of a known malicious redirector chain. The document body and embedded URLs are designed to lure users into clicking these links, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coin-master-coins-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-app_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/make-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-a-roblox-account-easy_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_003_off00004a48.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A48 25544 bytes
SHA-256: 05aff2595cef8071aa64d138a06ef7df0c88ecf58f5223f3a53205727646aebc
font_01_sfnt_off0000848e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x848E 17544 bytes
SHA-256: 5ee316c89f58fa7ece53e10d1822e70a80b2e7ece9f31707ca69690d36fdc75d

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