Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b440ff434616a14…

MALICIOUS

PDF

34.4 KB Created: 2021-06-19 16:25:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 21f7e9aa5b330d052a5bfe344d96a978 SHA-1: 98f658a1ff26ff0826d23f80dac08d7525d3494a SHA-256: 0b440ff434616a14d7875b16888c1f0fb7312b09e2037f9eda152495eee1ac2c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically targeting users interested in game hacks and free in-game currency. The heuristic firings confirm the presence of malicious redirector links and a lure for free generators. While no scripts were extracted, the document body and embedded URLs strongly indicate a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-get-free-stuff-roblox-2021-game-hack In PDF document text
    • http://foo.com.tw/files/increible-hack-robux-pastebincom_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-without-installing-apps_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-website_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/tiktok-free-vs-premium_GM835599320.pdfIn PDF document text
    • http://foo.com.tw/files/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/buzz-the-bee-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spins-2021-ios_GM406889139.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
font_00_sfnt_off00002f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1B 22008 bytes
SHA-256: fe0d1a9432d2b4a01b68f9b331f6d3bf7396532960d36eb3bc37c2170271e7ba
font_01_sfnt_off00005fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDF 19460 bytes
SHA-256: 8768a9c4b3141a9c44b22f11f16aa4bbad12b2f6412dfe83f574a7ffa5e32049

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