Malicious PDF — malware analysis report

Static analysis result for SHA-256 5818503360145ac8…

MALICIOUS

PDF

33.5 KB Created: 2021-07-23 22:44:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8a278cc23cd5274dfe85623ebad335fb SHA-1: 5a65c97f5ed89a818493cce8a289e95b4fdab9b7 SHA-256: 5818503360145ac82a98eeda5d0d8a9467c594ba47d80457fc95d6f50881c95c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector infrastructure. The document body text and heuristic firings indicate a lure for free Robux or game hacks, designed to trick users into clicking the malicious links. The primary malicious URL identified is http://netcdn.tw/app/431946152/free-robux-without-doing-anything-game-hack, which is likely used to deliver a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/free-robux-without-doing-anything-game-hack In PDF document text
    • https://dirigentigiustizia.it/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-free-spins-for-today_GM406889139.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_off00002b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B5B 22532 bytes
SHA-256: 8c14d89e4b4d350310258dd975d9c9b85996132f3b73481305977f0e6ee73cc8
font_01_sfnt_off00005dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAB 19424 bytes
SHA-256: ce4897eff9d04202a557cf473123b6bbe5415239b22eda76d44945625b44829b