Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f420253212588c…

MALICIOUS

PDF

34.0 KB Created: 2021-06-29 09:21:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a4b060363065fb3b2a93a80bd2d333b7 SHA-1: 95b0900deb800f061a377782ea97ea661f47201b SHA-256: 83f420253212588c85a555288c60d6d66b75205fae8e3313fe3e18077b373502
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as free game hacks or gift card generators. The primary lure URL is http://netcdn.co/app/431946152/free-roblox-gift-card-codes-2021-may-game-hack. This behavior is consistent with phishing or scam campaigns aiming to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a malicious redirector chain.

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.co/app/431946152/free-roblox-gift-card-codes-2021-may-game-hack In PDF document text
    • https://www.tena-g.hr/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/artmoney-pro-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/robux-free-co_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/get-all-the-tattletails-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/coinmasterfree_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-obby-roblox-game-real_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/master-coin-free-link_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-cute-girl-outfits-for-free_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-hack-any-account-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-event-items-roblox_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_off00002c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C39 22176 bytes
SHA-256: 56641f2db74860533a98e60e9ff8e78e0022fc21c2ee71da95b739542693c2ca
font_01_sfnt_off00005d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D44 19828 bytes
SHA-256: 0c692891196d1d57162bf8c5cc4486d8cafd1dace673209e2c526bfe087f88e2