Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3990ba61c5a1be1…

MALICIOUS

PDF

35.0 KB Created: 2021-06-25 15:45:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2538a8ec9055b638a5ce56e5f05a3c0b SHA-1: 77dfea31df56f095c5b8427eb3baa3b3749586e7 SHA-256: f3990ba61c5a1be17cbff3d0b8da7e2294f7be29d27e434cf98e009bf7568aa2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector leading to a 'free generator / game hack' lure. The document body explicitly mentions 'How To Get Free Glasses On Roblox' and includes the malicious URL. This suggests the primary goal is to trick users into visiting malicious sites, likely for further exploitation or credential harvesting.

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-free-glasses-on-roblox-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/united-gaming-net-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/pubg-uc_GM1330123889.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/retail-tycoon-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/cool-free-roblox-skins_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-models-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/asshurtv2-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/we-are-developers-hack-for-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/elysian-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/i-hacked-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hacks-free-spins_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_002_off0000318e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x318E 22608 bytes
SHA-256: eccb0225cac87ed24d0fe4fe262eae6a21b36d03652a24955cf462282fc15dd9
font_01_sfnt_off000063ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63EF 18920 bytes
SHA-256: 1202849416388ac7a02dfccd4fcdb0a7f9802ad0ff004011d77accce7c282339

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