Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39e83dfc4c77dc9…

MALICIOUS

PDF

35.1 KB Created: 2021-06-30 07:56:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cf15609ebae6dbcf41f90e754b2ab282 SHA-1: 65330d330b1dbd7682d5814d99b3e89e60846bac SHA-256: f39e83dfc4c77dc96f37eaf866969e5d7d691a3028436aaee4f0c87a2fbfda52
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links, including one to a known malicious redirector, designed to lure users with promises of game hacks and free currency for games like Roblox and Coin Master. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely leading to further malicious content or credential harvesting. No scripts were extracted, but the presence of embedded URLs and the nature of the lures indicate a phishing attack.

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/how-to-get-2021-2021-account-roblox-free-game-hack In PDF document text
    • https://www.donjastubica.hr/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-roblox_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/speed-hack-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-do-i-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-to-hack-into-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/cheats-for-roblox-clone-tycoon-2-2021_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/tiktok-fame-free_GM835599320.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-5-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://www.donjastubica.hr/files/robux-generator-for-free_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-do-you-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-get-free-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-how-to-hack-royale-high-for-diamonds_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/javascript-free-robux_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-hack-coin-master-ios-jailbreak_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_off00003182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3182 22164 bytes
SHA-256: 75c23cf941bc34e850a7d4ffb05ab82c279bbe824225d5081c4d23c076a64336
font_01_sfnt_off000062a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A5 19460 bytes
SHA-256: a6920711f7fe5e030d76178c3c4512fb2bf143e4eaaae86491994aaaaec5fac7

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