Malicious PDF — malware analysis report

Static analysis result for SHA-256 038a3cb2a7949549…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 12:30:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 41c60a8b8e62b4cc2cd9ffc7337a2f04 SHA-1: bef9ea6019e6369da6cc94c348d65788f1a0e60c SHA-256: 038a3cb2a7949549eeb7167a23ed8ebbfb6be176ee50c73110c5dd1484b4c79c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting "Coin Master" hacks and generators. The document body, though partially corrupted, contains references to these lures and the primary malicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9804

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/406889139/coin-master-hack-iphone-game-hack In PDF document text
    • http://library.atim.ac.id/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/login-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/pokemon-go-free-808_GM1094591345.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-ad_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_004_off00004e04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E04 23704 bytes
SHA-256: 9018c2151226a171e538c3739cf3032ea29e0e52e905260182e8aff2b41cc3e9
font_01_sfnt_off000083be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83BE 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off00008da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA9 18060 bytes
SHA-256: 9ccc1d8bd8827427bdd2e576ac4afcbf92768d6c7b4bf1f6dc8c42a95cbbb1c2

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