Malicious PDF — malware analysis report

Static analysis result for SHA-256 546cbd44109b4093…

MALICIOUS

PDF

49.8 KB Created: 2021-06-04 00:44:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8f925d0d509ca1cd610bde92d45fa87c SHA-1: e81f216b13e765922d20f5ec9f99e582924ff977 SHA-256: 546cbd44109b4093f0bf30f1ce6d5b1451ec0f6b330da9c1290120f9d0f309b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The heuristic PDF_GAME_HACK_REDIRECT_LURE strongly indicates a social engineering tactic to trick users into visiting a malicious site. While no scripts were extracted, the presence of malicious redirector links and the lure content suggest the primary goal is to lead the user to a compromised or malicious website, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/431946152/free-robux-without-human-verification-real-game-hack In PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/get-robux-now_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/woman-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FF 27160 bytes
SHA-256: 8de9bb77e1a16beb628e6e5c421385e670c8586aaf412aa100e7d830739bf87c
font_01_sfnt_off00009021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9021 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D33 19296 bytes
SHA-256: fcd37aae12381262441149b3f055c838aea0a99c045645b338d4096dcdd54a9c

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