Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b06577f9f3495f…

MALICIOUS

PDF

42.3 KB Created: 2021-06-03 09:35:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2c5b1487978a3c393ac18c4dcfa67ae8 SHA-1: 4176d29f47cbd0db093cd2d27154f031fd569d9d SHA-256: c8b06577f9f3495f4059894fb2b021d6dbb70004b7600284758690263d7e086a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector for a 'game hack' lure. The document body, though partially corrupted, contains text and URLs consistent with a phishing attempt to trick users into downloading further malicious content. No scripts were extracted, but the presence of malicious links and the lure strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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-free-spins-link-game-hack In PDF document text
    • http://ebook.itn.ac.id/repository/robux-generator-com_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/coin-master-fun-hack_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://ebook.itn.ac.id/repository/free-flip-master-coins_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_004_off00004c53.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C53 24128 bytes
SHA-256: 539c76743547f988dc001248c615859aa39ebb82ea1f8ae1e091a268be216b4a
font_01_sfnt_off00008371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8371 18056 bytes
SHA-256: a4f33549350803e8a819cbfad6b4ff3cdc0b302ceab74af9f2f663eab6bd9ec0

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