Malicious PDF — malware analysis report

Static analysis result for SHA-256 85222139301fdea2…

MALICIOUS

PDF

43.4 KB Created: 2021-05-16 04:42:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2fbac823d30e3bc64bb4b02f2f33f5f0 SHA-1: fd61d902915a3bd61923e44da7993ab68d181fb0 SHA-256: 85222139301fdea2cfdb5dff197625da646d03d8b50e80a594673ca6fa9f8c8b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "free generator / game hack" lures. The primary malicious URL identified is https://netcdn.xyz/app/406889139/20-free-spins-coin-master-game-hack. The document body and embedded URLs reinforce the theme of game hacks and free in-game currency, indicating a phishing or scam attempt. No scripts were extracted, but the presence of multiple malicious links is a strong indicator of malicious intent.

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/406889139/20-free-spins-coin-master-game-hack In PDF document text
    • http://achauco.vn/public/upload/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-hack-mod-apk-download_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-minecraft-pe-for-free-ios_GM479516143.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_off00004a41.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A41 29536 bytes
SHA-256: df182ae9b65f18ed49b4c4db826875ec9e275e789426157ba4e7dbf414334a88
font_01_sfnt_off000087ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87AC 18180 bytes
SHA-256: 322b0d5b629f6df55fd3c77851cbfe7ee71104dfe1b9214827344950ced1d0df