Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c856b7c5388a4f…

MALICIOUS

PDF

35.0 KB Created: 2021-06-28 15:53:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 79d21ba2a9d8b3226e23f44b6b00004f SHA-1: 362b16aa915b4f1c644857b9f3e670d0b8533e73 SHA-256: 51c856b7c5388a4f17e4f6dedb2c29a6f1b5d06ec7b46c10986ac7b0a4fe1238
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links and embedded text promoting 'game hacks' and 'robux generators', directly leading to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the heuristics indicate a lure for free game items, a common social engineering tactic. The document's purpose is to redirect users to malicious infrastructure, likely for further exploitation or malware delivery.

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/www-roblox-robux-hack-com-game-hack In PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/haw-to-get-free-dominus-on-roblox-a-week-ago_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-roblox-exploit-2021_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-get-free-animations-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/where-do-you-send-roblox-vidoe-proof-of-someone-hacking_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/evry-thing-on-the-roblox-caolog-free-fast_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/buxblast-com-robux-cheats_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/actual-working-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/hack-download-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-free-outfits-boy_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/any-gamepass-free-roblox-script_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/robloxhack-pro-gamerscom-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-hack-scripts-for-ipad_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-roblox-gfx-artists_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-private-servers-roblox_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_off00003115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3115 22240 bytes
SHA-256: 5dd2002370cd75124260698aa5765e92799203cedb430f82aad0ed16e7a16da7
font_01_sfnt_off00006280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6280 19420 bytes
SHA-256: 207e4cab08dc07190f73cf1f834a34fa1ac72185b6c4627b9fb5c411fb558ac4

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