Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e692d7c0d57b0e…

MALICIOUS

PDF

33.3 KB Created: 2021-07-05 10:51:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d9971698278c18413fdbfffb3c934e69 SHA-1: 297c613f2dd5ebfa44d67f58de948a99fa67a27b SHA-256: 10e692d7c0d57b0e83dafaeaa83a8c71e72748eb5dc3649d253c51382c35396d
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically advertising "free Robux" and "game hacks". The document body and embedded URLs strongly suggest a phishing lure designed to trick users into visiting malicious sites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/431946152/free-robux-gift-card-codes-2021-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-in-roblox-games-to-get-gold_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-cheat-codes-for-pc_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-hack-on-phone-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/script-hack-roblox-piece_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pubg-uc-to-rm_GM1330123889.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-downgrade-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-2021-auto-redeem_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-for-roblox-2021-genorat-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-work-at-a-pizza-place-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/xray-hack_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/hacks-para-robux-gratis_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-avatar-stuff-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/900k-robux-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-giver-no-human-verification-on-pc_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/whats-robux_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_001_off00002b2d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B2D 21952 bytes
SHA-256: fe6723b12dfdf6e46190882f806c71a2a8374e73d0e2d2fb740905127e9ae655
font_01_sfnt_off00005b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B97 19516 bytes
SHA-256: 29e75f30c5e86761bb92b3b01e6b6c9178fe3a430d56702e6e4d31a38e0984ae

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