Malicious PDF — malware analysis report

Static analysis result for SHA-256 f918533bb44af29e…

MALICIOUS

PDF

44.4 KB Created: 2021-06-07 13:25:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 22011ba037a83eafb474aa15f845d898 SHA-1: 067221b69fb165811dceaa6bb8eb9bf37e941d1a SHA-256: f918533bb44af29ebf6c16414215eae26d162ed87acaa77a8d7f5d56f7239342
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a malicious redirector lure, specifically targeting users interested in 'free Robux' or 'game hacks'. The embedded URL, https://netcdn.tw/app/431946152/free-robux-for-mac-game-hack, is identified as a malicious redirector. The document body, though partially corrupted, also contains references to 'Free Robux' and the malicious URL, reinforcing the lure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/free-robux-for-mac-game-hack In PDF document text
    • https://www.campguru.co.za/images/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.campguru.co.za/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.campguru.co.za/images/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • https://www.campguru.co.za/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.campguru.co.za/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.campguru.co.za/images/free-robux-android_GM431946152.pdfIn PDF document text
    • https://www.campguru.co.za/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://www.campguru.co.za/images/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://www.campguru.co.za/images/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.campguru.co.za/images/cm-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.campguru.co.za/images/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://www.campguru.co.za/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://www.campguru.co.za/images/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.campguru.co.za/images/pokemon-go-basic-vs-premium-rewards_GM1094591345.pdfIn PDF document text
    • https://www.campguru.co.za/images/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • https://www.campguru.co.za/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.campguru.co.za/images/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://www.campguru.co.za/images/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://www.campguru.co.za/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://www.campguru.co.za/images/pokemon-go-free-incense-promo-code_GM1094591345.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_off000051b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B3 24856 bytes
SHA-256: ff87ba6f256dbaf4c5ced091607b32911a2511116bdb4dffb901bcf0409e6e1a
font_01_sfnt_off00008a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A9A 18436 bytes
SHA-256: a31af95eed0da8680be83cdf0d21721bc475ad609d411537ad7acb52b64b4317

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