Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b2cd0b3748cf18…

MALICIOUS

PDF

47.0 KB Created: 2021-06-03 14:46:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f56b02c8370f730d822a7ef081c8a942 SHA-1: e3167ef301119e56c19058da4cd34e418b51e9c4 SHA-256: f4b2cd0b3748cf18d2162ad47ae7d374566e981dc9dc8fc5b8a4136a778a723f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to what appears to be a malicious redirector infrastructure, specifically advertising free game hacks and coins. The heuristic firings strongly indicate that these links are intended to lead users to malicious content or phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a social engineering attack designed to lure users into downloading potentially harmful files or visiting compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/free-coins-for-planet-master-game-game-hack In PDF document text
    • https://perpustakaan.itda.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/robux-generator-2021_GM431946152.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_off00004f4a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F4A 25760 bytes
SHA-256: 9e862010ffc57f3e623ed6f12bbd13d10e0c37a1bffc6a6f79af78e87eed324f
font_01_sfnt_off00008b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B47 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off00009532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9532 18196 bytes
SHA-256: c562c37ec85c1a31376f1319708a817f13e9ce9d6f96008aa36ac2301c2a7916

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