Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b16393664eb7eac…

MALICIOUS

PDF

45.1 KB Created: 2021-05-15 12:00:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e1d4ce040d77d572f0f3225791538233 SHA-1: 27a6e352c010d2ac44b4e62e61d1280d95000049 SHA-256: 5b16393664eb7eac639880def8601723fadbbf089c0cb3530bc9fcd5d2b54c39
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and websites offering game hacks and free currency, indicating a phishing or malware distribution attempt. The document body and embedded URLs strongly suggest a lure for popular mobile games like Coin Master and Roblox. Although no scripts were extracted, the presence of malicious links and the ML classifier's high confidence score support a malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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/coin-master-free-coins-and-spins-2021-game-hack In PDF document text
    • https://jp.esuhai.com/upload/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/robux-match_GM431946152.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://jp.esuhai.com/upload/files/real-working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D2 24960 bytes
SHA-256: a15cf1e3cee8c87293fb25f10d6da16cec9a556b332d05fd77b6a5d8f8dd7857
font_01_sfnt_off0000837a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x837A 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2C 18460 bytes
SHA-256: 9b9248072d2421e664493d6d5ab14406474bc62db1d786ff94b6c1680f0f8261

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