Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4a21d2ccc4391b…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 12:55:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a8d28b590dec28a983d63ce453f2e6d6 SHA-1: c1269cd4cf20818f7f04ecd186a2b7979eced709 SHA-256: 1e4a21d2ccc4391bee3355717ac679b51125d4a1bc1829df069da39bb724caec
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' and 'game hacks'. The presence of embedded URLs and a malicious redirector link strongly suggests a phishing or scam attempt designed to lead users to potentially harmful content. While no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/free-robux-that-actually-works-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-free-admin-music-codes_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/pubg-uc-price-in-nepal_GM1330123889.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robux-scam_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robloxhacks_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-hack-coin-master_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_off000052ca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52CA 25212 bytes
SHA-256: ee443aa0bf7d9c5745f0c2053046007e2a2eded399629030189d6c0098edf389
font_01_sfnt_off00008d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D90 19136 bytes
SHA-256: e9e8736bed1826902485352f20294e96b644ee357cd6186db79dc9b33c578c67

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