Malicious PDF — malware analysis report

Static analysis result for SHA-256 431e3f5035a9bd3b…

MALICIOUS

PDF

45.4 KB Created: 2021-05-10 13:43:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 63a4633d303d34979fefd2c77fb94b4f SHA-1: 23b1ee2d6385527ff33049bd3b1403125dbe587c SHA-256: 431e3f5035a9bd3b5717ae0380d0e3bce3f37b45c7560019adc1548a33fb494b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded links that point to known malicious redirectors, disguised as "free generator / game hack" lures. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to a malicious site, likely for malware distribution or phishing. The presence of a visual download button further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/406889139/free-spins-coin-master-no-verification-game-hack In PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox40com-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-free-printables_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/wurst-18_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004be0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE0 24560 bytes
SHA-256: 7c97468e5ceee5ba048fe839a6b2a213b0dc5637f2e526d081a815b2158072a1
font_01_sfnt_off00008455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8455 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00008f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7E 18020 bytes
SHA-256: 77b170e61ca69d8811d571f4609d25c793482ce418daab97f8cf0cf89b73ec51

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