Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b1dda88645f7fd…

MALICIOUS

PDF

35.8 KB Created: 2021-07-06 14:27:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1c4113ef320fb5bde77f6d618533ca2a SHA-1: c41a077e689999424d5edbe7e8753e98e3c6e609 SHA-256: 16b1dda88645f7fd75ca38ab86c76120fb8b7ddae9a82d7f53fb4bafaec55cf4
160 Risk Score

Malware Insights

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

The PDF document contains multiple links, including one to 'netcdn.tw', which is flagged as a malicious redirector. The document body and heuristics indicate a lure for 'free Robux' or 'game hacks', suggesting a phishing or scam attempt. The presence of embedded URLs and the nature of the lure point towards an attempt to trick users into visiting malicious sites, potentially for credential harvesting or further 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.tw/app/431946152/how-do-you-get-free-robux-without-doing-anything-game-hack In PDF document text
    • http://gornjastubica.hr/files/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-trucker-hat-roblox_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/slurp-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/weird-roblox_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-chill-cap-roblox_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-use-cheat-engine-on-roblox-without-getting-kicked_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-robux-site_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-hack-snow-shoveling-simulator_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/what-items-are-free-in-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/hpw-to-hack-roblox-android-step-by-step_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-get-roblox-premium-for-free_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_off0000301a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x301A 23228 bytes
SHA-256: c92121b6a58d0ba45d4dbff97116bb62c6e944a8cae780e2822eaa667e49cd86
font_01_sfnt_off00006450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6450 19980 bytes
SHA-256: a10b86a95e1163526836e1939e7e424d9e0b635c08126f71a6a7b060d93e13a9

Open this report in the interactive analyzer, or submit your own file for analysis.