Malicious PDF — malware analysis report

Static analysis result for SHA-256 90483eb0454276f4…

MALICIOUS

PDF

43.9 KB Created: 2021-06-09 08:28:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 274851cc5104f27f8eb14f19fa18a91c SHA-1: 50f33caa7cf8e7d8a46fbae59f9bd46762865f9b SHA-256: 90483eb0454276f4eab75e88e14d945d83cbdcc5155c3ddc8ba76fa3135c9875
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary link identified is https://netcdn.tw/app/431946152/free-codes-roblox-2021-game-hack. While no scripts were extracted, the document's structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at tricking users into visiting malicious sites.

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.tw/app/431946152/free-codes-roblox-2021-game-hack In PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/roblox-how-to-be-a-nerd-no-robux-no-hacks_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/roblox-free-robux-giveaway-id_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/get-free-items-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/tiktok-views-free_GM835599320.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/robux-hack-descagar_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/force-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/free-robux-roblox-hack-swirlycandygurl_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/get-free-roblox-bucks_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/her-roblox-acount-got-hacked_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/free-draw-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/hack-para-jailbreak-roblox-dinero-infinito_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/will-roblox-be-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/how-to-get-free-robux-on-computer-no-inspect_GM431946152.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • https://www.colgr.com/wp-content/uploads/fsqm-files/free-roblox-accounts-2021-january_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
stream_004_off00005175.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5175 23960 bytes
SHA-256: cb8ab33797cbec4e9ea7d70e04201982df5e1a529b4d6c4c603e37db1725113a
font_01_sfnt_off000087d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D5 18524 bytes
SHA-256: d3e41c551bbdcf156d7133dd3c339134e58de6f14fc7b48277bcdd0b90eb3f1f

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