Malicious PDF — malware analysis report

Static analysis result for SHA-256 7471f319853e9e21…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 20:32:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a57c7951cfddfc3ef15c2b90884590e5 SHA-1: e77d50c6bb1b079bea5de713103c1047d119aa5f SHA-256: 7471f319853e9e216bd73d6fd20331481612a9ce37ae2eb3c59e0b491c63fd2c
160 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, and the document body contains multiple links to external sites offering game hacks and currency. The primary link, http://netcdn.tw/app/406889139/coin-master-70-spin-link-2021-game-hack, is presented as a direct lure for Coin Master. The presence of numerous similar links suggests a phishing or scam campaign.

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/406889139/coin-master-70-spin-link-2021-game-hack In PDF document text
    • http://achauco.vn/public/upload/files/games-for-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-hacker-look_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-do-you-get-free-builders-club-on-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/get-a-free-roblox-account_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/comment-tre-un-hacker-sur-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/lazyblox-com-free-robux-ad_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-whatever-floats-your-boat-money-hack-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/chamello-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/pokemon-go-free-or-not_GM1094591345.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_off0000302d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302D 22524 bytes
SHA-256: b00c58e8dc74de321fd7532e5f36599f64da13c7d88918af29572274830e189a
font_01_sfnt_off0000625e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625E 18640 bytes
SHA-256: 15121af3aaca2a4d002688ab4f70cd272963d47b7b01ecd679e2d556af85fb23