Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a68e4b3a905e2c…

MALICIOUS

PDF

43.4 KB Created: 2021-06-03 22:55:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1447ff0e6a75750e6a126fee2ffa1cd4 SHA-1: 6b9f4962124a27546560a044e1e4883722d5997e SHA-256: a8a68e4b3a905e2c4774353547a5ded68f886f088a49a395d8c3396cc954f15f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector leading to a "free generator / game hack" lure. The presence of embedded URLs and the critical heuristic firings strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful content. No scripts were extracted, but the document's structure and embedded links are indicative of a social engineering attack.

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-hack-2021-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-system_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/pokemon-go-free-daily-box_GM1094591345.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-download-windows_GM479516143.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_off00004ec2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EC2 25308 bytes
SHA-256: 30cc9857664158993161954e53ef27a4bbfea9c205a98eaf79a8486bc168dda0
font_01_sfnt_off0000864b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x864B 18456 bytes
SHA-256: 8f74d6ddd2abce9f563610cbfcc253ce51c057807514da134dc64dcb58b7111e

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