Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff559c9206621922…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 07:35:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 042ecd226575e096f35033af6d986416 SHA-1: c0b155e803d1d5ee3c263138596355d471f874f1 SHA-256: ff559c92066219227b575d39468cedbe0584a0d5615b63fad4e1b41a9484ce5d
220 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are part of a link farm designed to lure users with promises of game hacks and free currency. One primary URL, http://netcdn.tw/app/406889139/fbchampion-com-game-hack, is identified as a malicious redirector. The document body, though partially corrupted, contains references to these lures and the wkhtmltopdf application, suggesting it was generated programmatically to host these links. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/fbchampion-com-game-hack In PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-elemental-battlegrounds-free-diamonds_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-hack-roblox-with-odium_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/download-roblox-hack-android-apk_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/village-4-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/without-pokemon-go-free-evolve-after-trade_GM1094591345.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/hack-on-roblox-of-how-to-walk-through-walls_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-content-deleted_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/cookie-logger-hack-roblox-account_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-robux-in-games_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-map-install_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-copy-others-chat-hack_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-robux-no-verification-ios_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-mad-city-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/r17-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-rs-hack-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_002_off00003125.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3125 23112 bytes
SHA-256: e02c23e1add7a3fc15bb455b4368742373e6d00173dc83dd60e1d16c0de63926
font_01_sfnt_off00006518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6518 18656 bytes
SHA-256: 5b63d62eabdfb7070366ffcdbeca1c67f897ffb042accd2c51ab2adc3e16efa4

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