Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dff2183bb8e031…

MALICIOUS

PDF

45.0 KB Created: 2021-06-04 00:15:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b8b21842798db9f729adf643bee0d2d1 SHA-1: 8bdf991bad0add03beacd1b57e1eea4cfd4c5f9d SHA-256: a6dff2183bb8e0315b7a6ec7fdc7129aab9323c539db6938d91b936f5a29c77c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links that redirect to a malicious website, masquerading as a 'free generator' or 'game hack'. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs points to a phishing or scam attempt. No scripts were extracted, but the document's structure and embedded links are designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/free-spins-coin-master-links-thursday-november-28-2021-game-hack In PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/tiktok-free-download-video_GM835599320.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/coin-master-free-spins-link-haktuts_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_off00005258.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5258 24044 bytes
SHA-256: a829bc3794bda725c85df9da05957c2a01839d6c9ce41a22ed3aeaebc1714802
font_01_sfnt_off000088c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C5 19860 bytes
SHA-256: d63300f936d8bb545b77e0b0c2e21733cc6fa46b1c79ade6db784861823ff386

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