Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3bcd20ee2838c1…

MALICIOUS

PDF

41.8 KB Created: 2021-05-19 06:38:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 453b23961e2c16ab273885cc2d71aca4 SHA-1: 555907922cc828412cb58d5623821243f90e871f SHA-256: af3bcd20ee2838c1679caa78199024d9340e7ada1a4899dc9b3ae5df786f968a
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 game hacks and generators. The primary malicious URL identified is https://netcdn.xyz/app/1330123889/pubg-uc-770-game-hack, which is associated with a lure for game cheats. The document body and embedded URLs reinforce this lure by referencing popular games and in-game currency. No scripts were extracted, but the embedded links and heuristic firings strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/1330123889/pubg-uc-770-game-hack In PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/www-robux-us_GM431946152.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://jdih.ptun-denpasar.go.id/assets/CKImages/files/www-roblox-com-free-robux_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_off000046c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46C0 26256 bytes
SHA-256: bf3068e083194e3d6b483e7626d8e50ce70782ced3424d4e2679bc4fa7369b95
font_01_sfnt_off00008178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8178 18128 bytes
SHA-256: bbc3a475f3a8327cefe3a526df791d3a70c6f168a54018ef7f177df434f06277

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