Malicious PDF — malware analysis report

Static analysis result for SHA-256 efea5ded14e22b66…

MALICIOUS

PDF

38.1 KB Created: 2021-07-04 16:10:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ce48e0ec01deb83890873df93ff50722 SHA-1: 801ba9241a30f2f4492db03b6883ecd40b66ce24 SHA-256: efea5ded14e22b662eb9238b54e07b68307117153787e988c376002719c91e90
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that point to known malicious redirectors, specifically advertising 'free generator' or 'game hack' lures. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves tricking the user into clicking these links, which likely leads to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.tw/app/431946152/free-robux-games-that-actually-work-game-hack In PDF document text
    • http://www.museodopobo.gal/web/uploads/files/roblox-hacks-phantom-forces-old_GM431946152.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/free-robux-link_GM431946152.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/how-to-hack-epic-minigames-wins-roblox_GM431946152.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/games-that-can-get-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/teleport-roblox-jilbreak-hack_GM431946152.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/coin-master-free-food_GM406889139.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/roblox-girl-shirts-for-free_GM431946152.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.museodopobo.gal/web/uploads/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B28 22728 bytes
SHA-256: fa149f64fb12cb7339674598f2f4ff89606014742cf8c3ddc4cd99ea002edaf9
font_01_sfnt_off00006dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFD 19868 bytes
SHA-256: d6d6c21ebfb94ec66429bf50c50e6ebacf9910fb21d66d19805e4ed0a6b06ac7

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