Malicious PDF — malware analysis report

Static analysis result for SHA-256 538302aacf4aaee1…

MALICIOUS

PDF

43.5 KB Created: 2021-05-13 17:03:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 190051b4af27a00b42ae467b112c4e25 SHA-1: 4f67dfdefb1fcd5d4b420fd07f566e39507b1b0d SHA-256: 538302aacf4aaee1753ea59dda79affa0f3eb8d300068246ecb08f12ad3c7181
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to malicious redirectors and other malicious PDFs, masquerading as 'game hacks' or 'free generators'. The primary lure appears to be related to 'Coin Master' and 'Robux' scams. The document body contains obfuscated text and URLs, indicating an attempt to disguise its malicious intent. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/406889139/coin-master-free-link-app-game-hack In PDF document text
    • http://escolaarboc.cat/images/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/roblox-hack_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/minecraft-free-online_GM479516143.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://escolaarboc.cat/images/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-master-free-spins-hack-iphone_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
stream_003_off00004663.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4663 30320 bytes
SHA-256: 6baeee459fd271f3b18dde43b1010d6176c6084b85b6a72b4390e890c5967f57
font_01_sfnt_off00008862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8862 18056 bytes
SHA-256: 1a2c2892b32475cb14a35fef15f830f1a64d39087a7078651a892349b640ffcb

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