Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffd561a4c924c6f…

MALICIOUS

PDF

45.2 KB Created: 2021-05-11 15:43:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 18117c8fda63718d142b8469c71e9553 SHA-1: 00494cd423ab6475e6a34b30e08c90bea38f8487 SHA-256: 9ffd561a4c924c6f5665147dff4230d3c411a0ce2b5652d08ab93795825d1cbd
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains a malicious link disguised as a 'free generator / game hack' and presents a fake CAPTCHA to trick users into clicking it. The link leads to known malicious redirector infrastructure, indicating an attempt to deliver a secondary payload or phish for credentials. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-apk-mod-hack-download-game-hack In PDF document text
    • http://smkn1salatiga.sch.id/library/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/coin-master-tiradas-gratis_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_off00004bd2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BD2 24996 bytes
SHA-256: 3f4b971cb9390a222d6685f1310022752727ee71ca4aa929d055576102cfff50
font_01_sfnt_off00008261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8261 3204 bytes
SHA-256: 8c2546387700f45186c395d475006178ee984eabbc175bcf1ee6eb58ba8b57aa
font_02_sfnt_off00008d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D65 18472 bytes
SHA-256: 5bc0de2c636e77828c86a011ee4eef73512f75bfa2aaa85a990f8b4c327860b3

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