Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea38615f5a5a90ac…

MALICIOUS

PDF

47.4 KB Created: 2021-06-03 05:44:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 70f940360474111c04b18cfdced63b65 SHA-1: accfe359046bbd15d7837225a1c9a33b5db3a1ae SHA-256: ea38615f5a5a90ac43683a9239be6da892ec60b387cd431175adb7ab7f807213
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free generators" for popular games. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links reinforces this. The document's primary function appears to be social engineering users into visiting these malicious sites, likely to deliver further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/479516143/minecraft-bedrock-client-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-bedrock-hacks_GM479516143.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_004_off00005216.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5216 25744 bytes
SHA-256: 1cad6a91d7211726e6e819aa3878c94262fc2100baa0088e060c1c645c7c14d5
font_01_sfnt_off00008c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C42 2940 bytes
SHA-256: ae8acc7f13e86db3aed98d7dfb73e70e16f4dedb45e9f0467460b76f54e1a1bb
font_02_sfnt_off00009650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9650 18344 bytes
SHA-256: c9cb66d1f867d8d8b778a8f6a6e4b7827efe3961d145c36f38d04236c8971b27

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