Malicious PDF — malware analysis report

Static analysis result for SHA-256 13444d1553a81444…

MALICIOUS

PDF

34.3 KB Created: 2021-06-18 16:55:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9b8d10dfcbaf562099909ee22dd1242f SHA-1: fa236feb7ed2923cd91371836788cb9d81366975 SHA-256: 13444d1553a814449d0ba9f0902d2f303719427f6038b89b2d4b325cbf8da0d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs and a visual call-to-action, strongly suggesting a phishing or social engineering attempt. The ML classifier also flagged this PDF as malicious with high confidence. The primary URL, http://netcdn.co/app/431946152/win-free-robux-game-hack, likely hosts a malicious payload disguised as a game hack or cheat.

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/win-free-robux-game-hack In PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/download-roblox-windows-10-free_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/cheat-roblox-en-francais_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-rpg-hack_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-get-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/wurst-115-2_GM479516143.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/robux-hack-may-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-robux-generator-august-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/free-bighead-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F41 22296 bytes
SHA-256: 92a882c82bc2e39616244ecb1d16ca8a0107b29fe9b49834f3fb6406196cb150
font_01_sfnt_off000060eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EB 19036 bytes
SHA-256: 866c875b7ada575fda7e0b2d16b4e3d455f2c28d19dc14b305271f934871ca62

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