Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef6b356024ca852…

MALICIOUS

PDF

43.8 KB Created: 2021-06-04 02:38:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2ebea6e6331be5db8097c22d17c1a0fc SHA-1: 872a163311506b53ea95b02459521923855e477e SHA-256: 3ef6b356024ca8523e75499500093ff5a7795f31978109c72346b47c86381f3d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body, though heavily obfuscated, contains references to the same malicious URL. The presence of a visual download button further supports the lure tactic. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-app-game-hack In PDF document text
    • http://ebook.itn.ac.id/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/proto-hack-roblox_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-roblox-id-codes_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-get-roblox-premium-for-free_GM431946152.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_004_off000051fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51FE 24504 bytes
SHA-256: 32b51869549dad214076f71d5f60385dd44148f2c39f20a1c05da4dee31cedb1
font_01_sfnt_off00008a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A15 17724 bytes
SHA-256: 339b5b6fe59ead3b36abdaa7c47f6a088c65e9e818337b9290cb92488f21cdbf

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