Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9afb4939c5b7718…

MALICIOUS

PDF

32.3 KB Created: 2021-07-19 11:56:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 80f11221799a6af3ee4fd635d1344678 SHA-1: c604f9a72aa2aeb924b548905d9d66add743942e SHA-256: a9afb4939c5b7718eebfffad060e15bdf39c897b2a17c2d1c395f4c4f19eeac7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to what appears to be a malicious redirector infrastructure, specifically advertising 'free Robux' or 'game hacks'. The document body includes a call to action to 'CLICK HERE TO ACCESS ROBUX GENERATOR', further reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9582

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.tw/app/431946152/how-to-earn-free-robux-game-hack In PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/minecraft-pe-free-apk_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_off000029df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29DF 22468 bytes
SHA-256: c6ea0b16efc354d120c6851683e6ab727d862a3b78bd96ca7e9ac623b66e0fdd
font_01_sfnt_off00005b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B76 18592 bytes
SHA-256: 5f937b01d2564a1e5fa4c0b4366c64548c36994ef3892cbb218ece3c84f10115

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