Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb58b5d8ff3dadb8…

MALICIOUS

PDF

46.6 KB Created: 2021-06-09 01:48:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fb7aa2986338da5d47a39e03597465ab SHA-1: 12332d6c200dd7bea884707644baeda6cfd9b430 SHA-256: cb58b5d8ff3dadb8cd0bf510a55c5caa5966e4bc53ddcf74f9970f6d067b09cd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector domain, which is a common lure for distributing malware or phishing pages. The document body and heuristics indicate a 'free generator / game hack' theme, likely intended to trick users into downloading a malicious payload. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lure strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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-2021-no-survey-game-hack In PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-anything-in-catalog-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-spin-and-daily-news-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/pokemon-go-free-8-km-egg_GM1094591345.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-without-human-verification-on-ios_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/hacks-para-roblox-para-conseguir-robux_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/tiktok-free-view-iphone-wallpaper_GM835599320.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/roblox-free-followers_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_off0000546c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x546C 27308 bytes
SHA-256: 72f62b3dc6b218efef21c1b62ee1bd60e5e738f6c8c10e701b1fc64d997eb0e6
font_01_sfnt_off00009252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9252 18712 bytes
SHA-256: b014ec31eb6e850af6d587ce685c4fb15b39a0900be7ac49fa553f9a857082cd

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