Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd30733a68a5d3a3…

MALICIOUS

PDF

45.1 KB Created: 2021-06-04 01:35:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a1ff9c5ef39c3c4ab33b18713ca612b8 SHA-1: 40f474ed11450248df8b15121bb1ed05807e09d3 SHA-256: fd30733a68a5d3a308cd4fe172bc79a46fd229d1376b5888b692d0f250156cef
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generators' and 'game hacks'. The document body, though partially corrupted, contains references to these lures and the primary malicious URL. The presence of these links and the ML classifier's high confidence score indicate a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/431946152/robloxbux-us-generator-game-hack In PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/is-pokemon-go-fest-free_GM1094591345.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/woman-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/mathep_GM431946152.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_off00004f9b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F9B 26376 bytes
SHA-256: 7c6c79404cc693ec272d28758e348ff4dfd6a76fd7efab99fffcceee9cfd065c
font_01_sfnt_off00008d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D26 18444 bytes
SHA-256: 7917d6e924cb6db73036ee403938ed3af44b5ec1e3e3e35d9261f8b0f349792e

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