Malicious PDF — malware analysis report

Static analysis result for SHA-256 5503cc37a0f8d6da…

MALICIOUS

PDF

43.9 KB Created: 2021-06-09 03:47:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 551ae633f8cf20ca2a3e5cc5294b7c82 SHA-1: 2f4957c2107e0d96c3b1344283ef1a50ddd1afa0 SHA-256: 5503cc37a0f8d6dae78e51538ed92a345254cf1cb7510e6e4b6cc23a4993cffa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with the promise of 'Roblox Hacks'. The embedded URLs, such as 'https://netcdn.tw/app/431946152/roblox-hack-for-android-no-survey-game-hack', are designed to lead users to potentially harmful content. The document body, though partially corrupted, also contains references to these lures and additional suspicious URLs.

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/roblox-hack-for-android-no-survey-game-hack In PDF document text
    • http://modlingua.com/images/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://modlingua.com/images/mad-city-roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://modlingua.com/images/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://modlingua.com/images/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • http://modlingua.com/images/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://modlingua.com/images/free-spin-link_GM406889139.pdfIn PDF document text
    • http://modlingua.com/images/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/roblox-redeem-card-hack_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/tiktok-free-6-months_GM835599320.pdfIn PDF document text
    • http://modlingua.com/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://modlingua.com/images/roblox-lumber-tycoon-2-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://modlingua.com/images/how-to-get-robux-free-on-roblox-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
font_00_sfnt_off00004f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F2F 24300 bytes
SHA-256: 665c3e4c05029b529f262765d7d4b72e5a1c5ccc0fa0cf247a64da171b41b221
font_01_sfnt_off0000868c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x868C 19076 bytes
SHA-256: 145cb39f2721d0adf9158d774fea23915bc38a4c9e7cf0fb35ae5cb0abc6301a