Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a33fb33b1e55def…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 09:53:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7d6dac5b56b16693688367e61441d8cd SHA-1: 934c8a24743760302fc5fe6936210b66f718d8f6 SHA-256: 1a33fb33b1e55defc8af831a4f8a85cddea61fbc1ccd21da0a1a651812e05d44
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirectors and potentially malicious domains, disguised as a 'free generator / game hack' lure. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lead the user to download further malicious content or visit compromised sites.

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/479516143/cool-minecraft-hacks-game-hack In PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/coin-master-level-3_GM406889139.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/robux-get-com_GM431946152.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • http://www.otomasi.uinjambi.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.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
font_00_sfnt_off00004f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F84 25240 bytes
SHA-256: 3dcfa3d945325969ae247dc7edc3406f1a1197c0c4d7f47baaf0dc90dbcacd57
font_01_sfnt_off00008695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8695 17956 bytes
SHA-256: 052a8056d5e76bd054e8f6de415126dc7fc526d2c477c3dbde74b8be28c4271b

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