Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e721775b728748…

MALICIOUS

PDF

32.9 KB Created: 2021-06-19 23:52:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6a5e1f94544c04698762ae383721acc6 SHA-1: 5e86ab259b08de23c3de35b19df35f06547cfe18 SHA-256: b5e721775b728748630c3474a642897eae363fff4ea81d8015b14403233009b9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites that promise game hacks and free in-game currency, such as Roblox Robux. One critical heuristic identified a link to known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/cheat-roblox-adopt-me-game-hack. The document body also contains a call-to-action phrase, 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/cheat-roblox-adopt-me-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/penguin-roblox-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/no-hacks-working-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/optifine-pe_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-admin-button-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/anti-ban-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-net_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-account-with-limited-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-into-your-friends-roblox-account-with-robloxsecurity_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-server-side-explit-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/tlcharger-hack-roblox_GM431946152.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A51 22020 bytes
SHA-256: a080c1ed02e45089726730fb314ed099f6b31fa9ec713149b2cd5ec7e8e3d3ef
font_01_sfnt_off00005b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0B 19304 bytes
SHA-256: bd7dfc16715c158d7dedffa14ba39c2c1d738df0c9e61c5904053a68a3e2cfe6

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