Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f7ecdb5724b3e5…

MALICIOUS

PDF

45.8 KB Created: 2021-06-08 22:50:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a6cd1996f36eb28ac9ab0d5e2510ab65 SHA-1: d1490eb58d3fdfd8b1d27b021d919f9f80d04ee9 SHA-256: f2f7ecdb5724b3e5ecab5019a3fde1da656db1b45a33f8943cf00c069e7c202e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains text and embedded URLs related to 'free Robux' and 'Coin Master' hacks, which are common lures for scams. The ML classifier flagged this PDF with high confidence, and an external URI pointing to a suspicious domain was extracted. While no scripts were directly executed, the document's content and structure strongly suggest an attempt to trick the user into downloading a payload, likely through the provided URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-robux-for-pc-no-human-verification-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-human-verification_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_off0000513f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x513F 27920 bytes
SHA-256: fdc7a8159bd1748cca9d369583af39512423f963d1a481479a264b5ddb7c9cdc
font_01_sfnt_off00008e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E96 19012 bytes
SHA-256: 9a291a44bd2a9a80940787ab139a377da4018015de28712fcdc94309b2e16f23

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