Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec557225dca43339…

MALICIOUS

PDF

35.6 KB Created: 2021-07-06 00:44:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 97cec48ee1f9fc513810127a7afab7f4 SHA-1: 5cb7917129da2ee110b4cd4c7c1a087574ffa6fc SHA-256: ec557225dca433394c858802f6e7cf13fc8b465567b3ea7615a21cb58b72faaf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites that promise free game hacks and in-game currency, indicating a lure for potentially unwanted software or phishing. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports a malicious intent. No scripts were extracted from this sample, but the overall pattern suggests a phishing or social engineering attack.

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.tw/app/479516143/how-to-get-minecraft-windows-10-for-free-2021-game-hack In PDF document text
    • http://astdubai.co/userfiles/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/roblox-free-robux-legal_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-car-in-car-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-robux-no-survey-no-download-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/10-robux_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/rewardrobux-com_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://astdubai.co/userfiles/files/coin-master-daily-free-spins-2021_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_off00003571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3571 22156 bytes
SHA-256: a866375beca207b00c9c56e9fb499a2f2379825cdfb54275e5cf5765e4cfea1e
font_01_sfnt_off0000666c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x666C 18936 bytes
SHA-256: d89f9173c68b5ad3f200cf0910130a7487f46ddf269ae4e48135fb236ee99bed

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