Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71fc3ce418ee785…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 13:40:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1be71f1cb0b65b3a492b00f791ef3b0b SHA-1: be883fc2063ba51f37e47c7f431b8441f85590ae SHA-256: c71fc3ce418ee785e63cb8f085b5c6b9b552bae895660e5db86ad7db7bd3173d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to a known malicious domain, masquerading as a 'free generator / game hack'. The document body, though partially obfuscated, contains the primary malicious URL. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to lead the user to a potentially harmful site.

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/get-free-coin-master-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-account_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hax_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-working-hack_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_off00005470.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5470 25484 bytes
SHA-256: ae69700ce8447b82e1fdf3607c2d8c069a9f83898169835bbee8d8bb122ff02c
font_01_sfnt_off00008dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEC 17712 bytes
SHA-256: 21945d37724c890dd621455a00f6108c8bb3199d41d839a53701429653b6b663

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