Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a1592a877f58ce…

MALICIOUS

PDF

43.1 KB Created: 2021-06-03 23:13:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6b9fad506cc5596f82e9ccafe2ef0139 SHA-1: dca0931cc81854063180c7f3c9fab589981eaf27 SHA-256: b4a1592a877f58ce97d8a481b8a3a06ed7c5b4bad1770bd95c6832b97a12ea7c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that are identified as malicious redirectors, specifically leading to a 'game hack' generator. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful websites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/1330123889/pubg-uc-and-rp-generator-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/rbx-claim_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pokemon-go-free-coins-promo-code_GM1094591345.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/corn-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-linux-free_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_off00004cf2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CF2 24240 bytes
SHA-256: db682a3f85e15681ca2210f509d5c3516365c1659fd8ff9ef390e95d78b91d9f
font_01_sfnt_off0000841a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x841A 18720 bytes
SHA-256: 066a51492cc628d4d478b719b4e7d8842ad78451db0b8368591708cf10ab2c2a

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