Malicious PDF — malware analysis report

Static analysis result for SHA-256 104cbd969c2ea716…

MALICIOUS

PDF

34.1 KB Created: 2021-07-20 02:10:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a55d4adf721adec6787375d76a661501 SHA-1: 09c8d846c9e86d8224147c49b37ecb2990db6279 SHA-256: 104cbd969c2ea71691d4acfc4797e2d61d57ad152ffa8a28595f05d8aebc95bb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document body and extracted URLs indicate a lure related to obtaining free Robux or other in-game items, a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple suspicious URLs suggests an attempt to redirect the user to download malicious content or visit a compromised site. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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-get-robux-for-free-2021-game-hack In PDF document text
    • http://geopaper.ge/images/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://geopaper.ge/images/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • http://geopaper.ge/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://geopaper.ge/images/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://geopaper.ge/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://geopaper.ge/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://geopaper.ge/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://geopaper.ge/images/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://geopaper.ge/images/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://geopaper.ge/images/tiktok-fans-free_GM835599320.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_off00002d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D50 23136 bytes
SHA-256: 9ad7e28f0095ce4588372a09a3d3276ca613be5d626c6642855471b3fe476bf7
font_01_sfnt_off00006172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6172 18868 bytes
SHA-256: 5a8c8e86d5d4dd1cc9266912e870fa4b5beecfa6d543cb137e4a029f0406ff4b

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