Malicious PDF — malware analysis report

Static analysis result for SHA-256 3157afd15243a3fd…

MALICIOUS

PDF

46.6 KB Created: 2021-05-14 05:39:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: fb738811a8dc264b972a596efbb78d57 SHA-1: 87d282e4901d93fed21d24aa478afc88d2756a30 SHA-256: 3157afd15243a3fd0d1a062baa59341c36e08ab220c62a1babb16f0c7ae060e5
200 Risk Score

Malware Insights

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

The PDF file contains multiple links to known malicious redirectors and domains associated with game hack and free item scams. The document body and heuristics indicate a fake CAPTCHA lure designed to trick users into clicking these links, likely leading to further malicious content or downloads. No scripts were extracted, but the embedded URLs and the nature of the lure strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/free-robux-websites-that-actually-work-game-hack In PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/com-roblox_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/get-more-robux_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-robux-android_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/is-minecraft-free-on-xbox_GM479516143.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_off00004967.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4967 25200 bytes
SHA-256: e26c2ab6fefc9c99e32c9ff494da25efb134b887f3fe4262e8446cd2d63237fd
font_01_sfnt_off0000841c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x841C 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off000090c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C3 19252 bytes
SHA-256: f49525d2cb353299e95430044cca9c62699809686ebb763340304ea0e82a2cbb

Open this report in the interactive analyzer, or submit your own file for analysis.