Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2a34f8ed4c5515…

MALICIOUS

PDF

45.3 KB Created: 2021-05-14 07:11:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1c815f0a81fc61df4e52548e0c6e9b54 SHA-1: 7f4b61cd55eb57841f2bbd45aced8ff4e25298ab SHA-256: 4f2a34f8ed4c55156971b6a732cb13dbf8e4388c596253833f5ee60c39c92326
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to 'Coin Master Free Spins Hack' and includes a direct link to a redirector URL. This suggests a social engineering tactic to trick users into visiting a malicious site. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious redirector designed to lead users to potentially harmful content or downloads.

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/406889139/coin-master-free-spins-hack-but-no-surveys-game-hack In PDF document text
    • https://naturenz.vn/public/files/coinmaster-com_GM406889139.pdfIn PDF document text
    • https://naturenz.vn/public/files/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • https://naturenz.vn/public/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://naturenz.vn/public/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://naturenz.vn/public/files/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • https://naturenz.vn/public/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://naturenz.vn/public/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://naturenz.vn/public/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://naturenz.vn/public/files/free-robux-images_GM431946152.pdfIn PDF document text
    • https://naturenz.vn/public/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://naturenz.vn/public/files/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • https://naturenz.vn/public/files/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • https://naturenz.vn/public/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://naturenz.vn/public/files/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • https://naturenz.vn/public/files/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • https://naturenz.vn/public/files/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • https://naturenz.vn/public/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://naturenz.vn/public/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://naturenz.vn/public/files/coin-free-spin_GM406889139.pdfIn PDF document text
    • https://naturenz.vn/public/files/free-robux-without-downloading-anything_GM431946152.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_off00004b00.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B00 25140 bytes
SHA-256: 28f35ad530135bde7739338c9311adc312f4639e2370f634d46a1af2fe4eafb0
font_01_sfnt_off000083c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83C3 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00008d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D66 18708 bytes
SHA-256: e0937bcd33a3b629f0687db8d98eacd8293f1078019919402bc9ac6e2a33e1b3

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