Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e82aca257d0e453…

MALICIOUS

PDF

42.5 KB Created: 2021-05-10 16:10:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 315fb22bf6581dc87a2a48f3d5a87ecd SHA-1: e1cd376e4623d7914673fd7ee63e4d83d17e3475 SHA-256: 3e82aca257d0e4539c07ce00a7ce21744934049f29ed2aa41294645853670fec
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, specifically promoting game hacks and account password generators. The embedded URL, https://netcdn.xyz/app/431946152/how-to-hack-roblox-accounts-passwords-game-hack, is identified as a malicious redirector. The document's structure and content strongly suggest an attempt to exploit user curiosity for malicious purposes, likely leading to further malware downloads or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-to-hack-roblox-accounts-passwords-game-hack In PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/coin-master-free-food_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/coin-master-hacks-reddit_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/mcpe-free-download_GM479516143.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://buanaabadii.com/ckfinder/userfiles/files/hack-coin-master-spin_GM406889139.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_off00004a41.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A41 24728 bytes
SHA-256: f4c6c36be6a0530403e853a97d1660f147a5583c84330f3b3a72edd3c0f3f356
font_01_sfnt_off000081cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81CF 18916 bytes
SHA-256: 1a35cdd5966ddf5a07fa4c0cf1a4b7623ebf18d314e768fc1998c6779142cc7b

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