Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78f1b5089b35796…

MALICIOUS

PDF

45.4 KB Created: 2021-06-04 00:16:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6cd4034188e9a70a2b7564bd978b95bc SHA-1: 045222fa375f36237bd67b680ac7be2a70ae1837 SHA-256: f78f1b5089b35796f4437a7531adfd4315149be86ca7d6249c5879ecbaf047e4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games. The primary malicious URL identified is https://netcdn.online/app/406889139/coin-master-free-gold-cards-game-hack, which is associated with known malicious redirector activity. The document body, though partially corrupted, contains similar lure text and URLs, reinforcing the phishing and redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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/coin-master-free-gold-cards-game-hack In PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/free-black-roblox-music_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/rbx-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/coolest-free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004de0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DE0 25256 bytes
SHA-256: 62f94c81cf1d1217a69f2942f33ac693cbdb2ed31668d3214479f575e383e183
font_01_sfnt_off000085e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85E9 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00008f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9C 17960 bytes
SHA-256: aba9a61c61b61fea048b73d77d5e297f3d5a3a83c57e433c8854d820da1f91b9

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