Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c33b2db05ea3d9…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 23:31:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3de9fedcd592c7408cb55c4c96052c25 SHA-1: 59511710f393095a92b5a948b02250a5fe9e54b2 SHA-256: 91c33b2db05ea3d97563f68e4fb02122c80da30e710ecc32d9284d9c7fc2c41b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically promoting 'free Robux' and 'game hacks' as a lure. The primary redirector URL is http://netcdn.tw/app/431946152/how-to-get-20210-robux-for-free-game-hack. This pattern suggests a phishing or scam attempt designed to lead users to potentially malicious websites. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a malicious intent.

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.tw/app/431946152/how-to-get-20210-robux-for-free-game-hack In PDF document text
    • http://fobh.net/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/tiktok-free-college-books_GM835599320.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/ww-roblox-come_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-stars_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-robux-2021_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
font_00_sfnt_off00002ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EBD 21892 bytes
SHA-256: f6d54bb6f3413258b532747986d4ab1c39fa3b3569c2f369122a059bdb88f8d8
font_01_sfnt_off00005ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF7 19384 bytes
SHA-256: d24c0e100c944da15398cc03dd439e143cfc9f9497013523985f2333f6259ff5

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