Malicious PDF — malware analysis report

Static analysis result for SHA-256 5663bcabe7c10135…

MALICIOUS

PDF

45.4 KB Created: 2021-06-07 07:23:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c9a93625b8959608279a6731d0267c25 SHA-1: 488bf62ebe4f54bfa6ad32ab21835f237fdde934 SHA-256: 5663bcabe7c101359123c12c1485f7b71681d4f94d893b829279f0c87904c8b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically promoting 'free generator' and 'game hack' lures. The document body and embedded URLs reinforce this theme, aiming to trick users into visiting the malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/2021-robux-proof-for-free-game-hack In PDF document text
    • http://perpus.unpam.ac.id/repository/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/optifine-pe_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/master-free-spin_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/daily-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://collectrobux.coIn 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_off00005311.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5311 26548 bytes
SHA-256: 40f91ba28c0c5cd9bbb48e62efe83c94aa3920e2224a1a5f9cbd6f4242100cb6
font_01_sfnt_off00008e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E08 18568 bytes
SHA-256: a469acb762b8bc26fb85ca1d20da2b8f3c5649a5f5e9c6b60974154390c426a7

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