Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa3697c89787a95…

MALICIOUS

PDF

45.4 KB Created: 2021-05-17 10:21:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 79cbecc8409f457f32341a1f824e7324 SHA-1: 4a86e386414018a034584ee5a591b419a79c4d28 SHA-256: afa3697c89787a95a3717ada9025aa66f64c566785310c4721a9e82a9c21fcc5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links that redirect to malicious infrastructure, disguised as free game hacks or generators. The primary lure URL is https://netcdn.xyz/app/479516143/how-to-make-your-own-minecraft-server-for-free-game-hack. While no scripts were extracted, the embedded URLs and the heuristic firings strongly indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/479516143/how-to-make-your-own-minecraft-server-for-free-game-hack In PDF document text
    • http://achauco.vn/public/upload/files/cool-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-daily-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a69.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A69 25336 bytes
SHA-256: 6d7a1b0e3c1bdbb14b9b57afc5ba34133d0083c1c1d6aebc594b7da7221a75c4
font_01_sfnt_off00008409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8409 3128 bytes
SHA-256: 801f6fa60decd1add2f223f91580103c35e150c924465f86a7a572b3e00674f9
font_02_sfnt_off00008e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E49 18460 bytes
SHA-256: 43abef8b834297908dc205ac191a436a457546b124377fb637ef7db2584f74fc

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