Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1d09eff02c20d3…

MALICIOUS

PDF

50.0 KB Created: 2021-06-09 02:30:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 19e4220a0c85391e3c74861002e501f2 SHA-1: 8f6c4745174c46fe50ffa72d7cdba74491012c53 SHA-256: be1d09eff02c20d350fe52077bacaa15c447a319e819c37788e744f28f44eadd
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as game hack generators. The primary lure is a link to 'how-to-hack-roblox-prison-life-on-ipad-game-hack', which points to the netcdn.tw domain. This suggests the document is designed to trick users into visiting malicious websites, likely to download further malware or engage in phishing. No scripts were extracted, but the PDF structure and embedded links strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.tw/app/431946152/how-to-hack-roblox-prison-life-on-ipad-game-hack In PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-jurassic-world-headphones-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-money-assassin-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-codes-no-builders-club_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hack-boku-no-roblox-remastered-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/rbxdemon_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-no-human-verification-and-no-survey-2021_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_004_off000053d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53D1 32480 bytes
SHA-256: 36a777978b17716efe425a3397d2f7a8193b860b0f998593bf1023cc11ca40d0
font_01_sfnt_off00009f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F5E 18968 bytes
SHA-256: 285a7d942f408599869e77bbf4472aae5690ad9553b410f0a88af5f447985c4c

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