Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58882a69e5d35ea…

MALICIOUS

PDF

52.6 KB Created: 2021-06-04 00:26:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8b836c1236d543a8222514a7f5ca362f SHA-1: e6cd741b26a5101f99410cfa812a9526115af6c4 SHA-256: f58882a69e5d35ea27bd9f1830a494a98e2ff6093e1bf5edb26749a5400c24c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious URL. The document body, though heavily obfuscated, contains references to the same malicious URL. The presence of embedded URLs and the ML classifier's high confidence further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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-coin-master-account-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-level-3_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005291.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5291 25996 bytes
SHA-256: 2364b8bfb736cdc3e716e53064688dcd42dba3f07d9ec7e5d1b69aad2ebcf3e2
font_01_sfnt_off00008dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAE 2896 bytes
SHA-256: 98478e2fbfabd582329b6206c0d46f67523cf5e299cb16118f1065b4dd5ec6a6
font_02_sfnt_off0000978f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x978F 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_03_sfnt_off0000ac1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1A 17848 bytes
SHA-256: f7120fc9d40fb44b0e1dad884c259b97d4cdc943ab10fa57fb5029601f08dd69

Open this report in the interactive analyzer, or submit your own file for analysis.