Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d757e79b171483…

MALICIOUS

PDF

34.9 KB Created: 2021-06-29 21:01:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a3d23c0a5d6d5116a70a6bc9490fa881 SHA-1: 39c2a82c5ded4d184ef6fb2f881bc3d18ede10b9 SHA-256: 51d757e79b171483c4dbe64b1892a02e0326abea53099f568151b96294888558
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector, masquerading as a 'free generator' or 'game hack' to lure users. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is http://netcdn.co/app/431946152/free-40-robux-survey-game-hack, which is likely used to deliver a second-stage payload or lead to a phishing site.

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.co/app/431946152/free-40-robux-survey-game-hack In PDF document text
    • https://perpus.uwhs.ac.id/repository/roblox-game-hack-scripts_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/roblox-robux-promo-code-hack_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/roblox-sword-hack-reacher_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/medikit-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/robux-hack-apple_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/free-robux-no-survey-no-human-verification-and-no-download_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/free-robux-obux_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/how-to-make-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/roblox-hack-tool-robux-and-tix-no-download_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/roblox-how-to-play-welcome-to-bloxburg-for-free_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/roblox-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • https://perpus.uwhs.ac.id/repository/free-t-shirt-roblox-catalog_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_off00002fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FDE 22648 bytes
SHA-256: 011b64897e1714197fdb1a48e260671272e99540cb22a75cab324ccf7ed2f6ba
font_01_sfnt_off000062bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BD 19244 bytes
SHA-256: b87dbd0b6eb470c40d77dee0f1c00d63381944028f5d85a2a4c85440a28974ef

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