Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c8925766070bea…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 12:44:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f9737bb1c72b449155026b191e7dcadd SHA-1: d3c99084d1b671853e4b86c2aff730809867bf86 SHA-256: a0c8925766070bead1644a17ca353d651f37d1c941048a9c97f07490e15d1021
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures related to game hacks and free currency, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

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/coin-master-hack-for-ios-game-hack In PDF document text
    • http://oca.undil.tl/repository/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/get-robux-today_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/moon-active_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-raid-hack_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FA 29836 bytes
SHA-256: 87d794a58d2b61aec8a7080b861cc27e487fb46c53530bee240b416bb603814e
font_01_sfnt_off00008f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6A 17880 bytes
SHA-256: 018df87e8b329981b4ee6e44d5bc42d6acec865ab2ec1ca80d52ebe5483b59a4

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