Malicious PDF — malware analysis report

Static analysis result for SHA-256 90aee238c1ad7c80…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 08:42:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0fa8850c663b2409391c6ca6955a9966 SHA-1: 6c40c0058d787ec7eb33ca6e300c84aa27365f69 SHA-256: 90aee238c1ad7c80cf65bebb9b878308eaca5c279a10da78e601429def529a2e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and further malicious PDFs, masquerading as generators for popular games like Coin Master and Roblox. The primary lure is to trick users into clicking these links, likely leading to further malware downloads or phishing pages. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a malicious redirection chain.

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-hack-dot-xyz-game-hack In PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-roblox-download-no-virus_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/robux-free-co_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/roblox-snyapse-free-dec_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/roblox-hack-robux-2021-apk_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-roblox-usernames-and-passwords-not-changeable_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/weird-roblox_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/robuxhub-net_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/www-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/how-to-get-free-clothes-on-roblox-2021-ipad_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002f55.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F55 23388 bytes
SHA-256: b0d727ad803cebe409a9bbd8e5e8bbac66d36e112ecc443072948a2c17a9fcc2
font_01_sfnt_off0000643a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643A 18660 bytes
SHA-256: c26c40ee4891c1d47adb0e8ebae699ddddaaac98e823d7b201e7cc814470c871

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