Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5da059872987ff…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 00:50:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: af85bc4f850bb8938b53acd1697b026a SHA-1: 39cdd984fa0d4e7795163edb07ced64367115580 SHA-256: fe5da059872987ff736da9f259b52f29274d709be4af9a2372eaccac5ef2a975
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'generators'. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links confirms a lure to potentially malicious content. No scripts were extracted, but the primary attack pattern involves social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/minecraft-hack-mod-game-hack In PDF document text
    • https://perpustakaan.stami.ac.id//repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-spins-cheat-deutsch_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-generator_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-hacking-kazuin_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-gift-card-generator_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_off00003117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3117 22612 bytes
SHA-256: 23f3ca060c36ad51e1c61d0f8ab8af43ea3cd12d9a02d09b3a2bbfd3269f32fb
font_01_sfnt_off00006354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6354 18340 bytes
SHA-256: 49e8d41e4645ecbcf6c8cca7b2812b927382294641a04bb93a79b652b6b1cc7e

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