Malicious PDF — malware analysis report

Static analysis result for SHA-256 44911d138d377097…

MALICIOUS

PDF

34.1 KB Created: 2021-07-20 06:30:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1691b36bf42b553d7fd37cbec476a4af SHA-1: 63f376f5454ee43b37e1ec365c978953c13ca5ba SHA-256: 44911d138d377097c978867219dc1d26ff1acf0ab4c4b11c1c087b5381077a8b
160 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'netcdn.tw', identified as a malicious redirector, which is designed to lure users into clicking for game hacks or generators. This link likely leads to the download of a second-stage payload or a phishing page. The document's structure and embedded links strongly suggest a social engineering tactic to exploit user interest in free in-game currency or cheats.

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-free-robux-without-verification-2021-game-hack In PDF document text
    • https://www.efeskbb.com/upload/content/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-robux-games_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.efeskbb.com/upload/content/files/free-robux-hack-generator_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_off00002c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C7D 22684 bytes
SHA-256: f56d3920d33c61d77a022c4652e14828b203ce3d2d45e6ccb82b71307ec865f9
font_01_sfnt_off00005f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F20 19716 bytes
SHA-256: 31d772b234aed95a2750b730f7eac7c290b38569e1ee667b89ac2bbd89a0a9fc