Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcda683db0f6afd0…

MALICIOUS

PDF

46.9 KB Created: 2021-05-10 18:04:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8e0d3f594db6ac14229a688bd0eaf9d0 SHA-1: f2073bef3685e9f5d261e4c691f7edbca33c2c55 SHA-256: dcda683db0f6afd09a38c91c02782c822aec0f8f15039cefdb6362bf0eeae128
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and generators. The primary lure is a "Coin Master Claim Free Spins" theme, directing users to a URL that is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/coin-master-claim-free-spins-game-hack In PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-official-page_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn 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_off00004916.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4916 28892 bytes
SHA-256: fce60f37e9c63e8079935ab95aee3b872a1a48e52a8c05864c20ed320f1c1544
font_01_sfnt_off000087d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D3 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off0000955b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x955B 18220 bytes
SHA-256: 4508a7247666ecd7f475af3e2510e2d7297b60fda6d209b486c2dc6be28a63e8

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