Malicious PDF — malware analysis report

Static analysis result for SHA-256 c374ac316bb2d88c…

MALICIOUS

PDF

43.2 KB Created: 2021-06-03 08:12:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b1818f12cd9d35479f03c745fd764f85 SHA-1: 71a6a2a2d1afb5074cb46222d056904c6b401a5c SHA-256: c374ac316bb2d88ca323b189d196065c6a32923e66460c034fc25ed837bdbc3e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics suggest a lure related to game hacks and free generators, designed to entice users to click the malicious link. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of malicious links and the lure indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/479516143/minecraft-building-hacks-game-hack In PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-hack-app-ios-download_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/www-rubux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-get-free-spins-on-coin-master-without-waiting_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
stream_004_off00004db8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DB8 24844 bytes
SHA-256: 3c5710b49c5e115215699d465ba499cb8ddac644f6cd29c8a51def04f280ddb9
font_01_sfnt_off0000855a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x855A 18628 bytes
SHA-256: 03be4b6b10a4c687c6c89c16a3bf013511456428a76c01e3ee63370f4522cf94

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