Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b036efc0e095e69…

MALICIOUS

PDF

46.1 KB Created: 2021-06-11 08:28:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ab43922b4e8537f4c0c49b9602683a0b SHA-1: 35c82adcc8e122552db09c8c99185af3ff87ad55 SHA-256: 5b036efc0e095e69b363fe327d599f9351ff922719ad1370be693666932b83ed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'free generators' and 'game hacks' to lure users. The primary malicious URL identified is https://netcdn.tw/app/431946152/free-robux-inspect-2021-game-hack. While no scripts were extracted, the document's structure and embedded links strongly indicate a phishing or scam attempt, likely leading to further malicious content or malware download.

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/free-robux-inspect-2021-game-hack In PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/roblox-sunset-city-money-hack_GM431946152.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/optifine-pe_GM479516143.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/www-coinmaster_GM406889139.pdfIn PDF document text
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/free-robux-giveaway-live-stream_GM431946152.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/roblox-money-cheats-that-work_GM431946152.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/how-to-pubg-uc-transfer_GM1330123889.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/roblox-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/how-to-get-free-robux-no-hack-or-download-2021_GM431946152.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/cheats-infinte-jump-roblox-fe2_GM431946152.pdfIn PDF document text
    • https://bbalitvet.litbang.pertanian.go.id/library/repository/exploit-box-free-roblox_GM431946152.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/roblox-scam_GM431946152.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://bbalitvet.litbang.pertanian.go.id/library/repository/coin-master-free-link_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_004_off0000544d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x544D 25772 bytes
SHA-256: f5967b40a86d6ce5b3758a27508cffea6da260ac860f42baeef31b66f9c4aba0
font_01_sfnt_off00009054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9054 18696 bytes
SHA-256: 8530932cf10006cd134890dd44a48c8e754caa16cdd5e57d0b6a2f76ea90587f

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