Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b892e33b109b18a…

MALICIOUS

PDF

42.2 KB Created: 2021-05-11 21:33:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 87c1106c3a49a4b7708c053a9485362c SHA-1: 9f8f71d3c7e7793f1876cbd87cbd6bad30d7cf89 SHA-256: 0b892e33b109b18aae185fa0284a4c4728983d8ad284269a4136fca590b10f37
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as 'free generators' or 'game hacks'. The document body, though heavily obfuscated, contains references to these lures and a URL that appears to be part of the redirection chain. The ML classifier also strongly indicated maliciousness.

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/406889139/how-to-get-free-spins-for-coin-master-game-hack In PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/roblox-person_GM431946152.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/114-4-hacks_GM479516143.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://lib.mesjidgedhe.or.id/perpuskauman/repository/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.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_off00004aea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AEA 24944 bytes
SHA-256: 4a5c65d34f2c75bebcb914fe0ff255c89e68bfba0adf3c2e3f4925befe502c98
font_01_sfnt_off0000836d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x836D 18052 bytes
SHA-256: 3cfae0e628493b06a11893ba870a091d0c1d4835c1ebffdd70b8f2a1c7d637a9

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