Malicious PDF — malware analysis report

Static analysis result for SHA-256 785a1fd3caa70e6c…

MALICIOUS

PDF

43.5 KB Created: 2021-06-04 03:10:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 631bd380b0d8b622a77c79a7a18eb9fd SHA-1: b4554bf1c0bbb53253658dc48586938a13b76956 SHA-256: 785a1fd3caa70e6c0f464c14f9acbf73a03ae36b5de659ebbb0ae5d90949cd8d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as game hacks and generators. The primary malicious link identified is https://netcdn.online/app/406889139/i-cant-get-free-spins-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a redirection-based lure designed to lead users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/i-cant-get-free-spins-coin-master-game-hack In PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/roblox-comcom_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-hack-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/robux-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/tiktok-free-view-iphone-keychain_GM835599320.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-you-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/freerubux_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
stream_004_off00005070.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5070 24808 bytes
SHA-256: 735049787db4576b4f6162fd0d37fa48623e15cf6d5c2d67ff50b6769572fdbe
font_01_sfnt_off00008896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8896 17884 bytes
SHA-256: 5820efde9e5fe16aed3c977de96073b5a9ded1f6c80170346f50cb4654f88eb8

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