Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efbc4d199970644…

MALICIOUS

PDF

41.2 KB Created: 2021-05-11 05:43:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 034ce642d9c87e1784f98188d8a23a85 SHA-1: 18fdefc16f1b04935b5b5e689475af3f9d1be6a4 SHA-256: 9efbc4d199970644701d1f2f36ffde123e00f4746935c22d3442d019c2b71cc4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically advertising game hacks and free item generators. The primary malicious URL identified is https://netcdn.xyz/app/479516143/minecraft-java-free-trial-game-hack. The document body, though heavily obfuscated, contains references to these lures and the authoring application, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/479516143/minecraft-java-free-trial-game-hack In PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/village-coin_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-do-i-get-minecraft-for-free_GM479516143.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_003_off00004907.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4907 24268 bytes
SHA-256: 034bf8768da5974020be92f6175e84b4bd7e5cb8254ee401231fb3d251bb53a8
font_01_sfnt_off00007fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD6 17924 bytes
SHA-256: d296bfe87a6dc97e41f58611965175a9d8d851c6709ce0e2d245db43bc469752

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