Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df88375f1cc647e…

MALICIOUS

PDF

42.7 KB Created: 2021-05-12 20:32:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0d4d0cbf91a7c17e47c4cbdd29370f2f SHA-1: 7c1b27526f3760b20a42db384b7f16255e56d365 SHA-256: 1df88375f1cc647e053a7c4ac2e48f482ec0c5e82995f1c5257fd2087d943ddd
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as generators for popular games. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body and embedded URLs suggest a lure for free game items, likely leading to further malware downloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/479516143/free-minecraft-java-code-game-hack In PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/how-to-get-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/strucid-aimbot_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stieppi.ac.id/repository/free-coin-master-spins-no-human-verification_GM406889139.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_off00004c32.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C32 24700 bytes
SHA-256: cfd36d596033f2cedb9677f5702d1f65ae3c385bc13f64bfeacc1602448f750c
font_01_sfnt_off000084fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84FB 18164 bytes
SHA-256: 3d382267cf92eff76cd83df568b6b4b4ad7e52a7e56d0c7bee3103fe475e98f9

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