Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a4852e59fe7d70…

MALICIOUS

PDF

42.4 KB Created: 2021-06-03 12:39:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 05c98bb7c5e3856fc46bc468b41408a1 SHA-1: 2f062ceed1dc7677d585f4d81d37d4a589a20943 SHA-256: 40a4852e59fe7d7036758f50affc04e543ba1e11469007980d23b2279a212033
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, including one that masquerades as a "free generator / game hack" for Roblox. The document body and embedded URLs suggest a lure for game-related cheats or currency, which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of a malicious workflow, likely involving a redirect to a phishing or exploit site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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-face-roblox-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com//repository/earn-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/level-coin_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-on-facebook_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/robux-survey_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/is-minecraft-free-on-xbox_GM479516143.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_off00004d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D53 23748 bytes
SHA-256: 7d322aa2e7228cf1347a3d5d1d861691e0407932dc30c10692f42c9778214734
font_01_sfnt_off00008336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8336 18176 bytes
SHA-256: 89cd2a226c48b85e3fd50639e1c54ff12a7aea6a284b12bd929af74d1649954d

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