Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8420b328beec93…

MALICIOUS

PDF

43.3 KB Created: 2021-05-14 21:48:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7f2a78b8ce68bb3afc7334adfde0d00e SHA-1: 6a5fca4b5481f1a8528f069a02559ac5ef3634a3 SHA-256: 4c8420b328beec9351c26f75b63109badfed05c60b569f4571c5e20d72d63516
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting free in-game currency and hacks. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the nature of the lures suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

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/431946152/free-robux-no-scam-game-hack In PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/coin-master-time-hack_GM406889139.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.maximabm.com/uploaded_files/userfiles/files/how-do-u-get-robux_GM431946152.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://maximabm.com/uploaded_files/userfiles/files/roblox-hack-me_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
stream_003_off00004bb9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BB9 25352 bytes
SHA-256: 1a90938989baa606d2fe9e0e8233905a2208f8e8b71791a71fa8d32848ae9bc9
font_01_sfnt_off00008652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8652 18500 bytes
SHA-256: b3a5a2e86a30a2234a3ee6d3c2f7de48a52411aef28342c5883490dd6d64f819

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