Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d4cbe93c89813c…

MALICIOUS

PDF

33.5 KB Created: 2021-06-27 16:32:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 469165cd8e515c00fe34533b89dd6dac SHA-1: d689a51deafcffa9bd6089ed68985aacd10d7830 SHA-256: d7d4cbe93c89813c6cd2bee8379d22c5fbff07f11ccd6adefbc366ea6b3935da
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/free-robux-vouchers-game-hack. This lure is designed to trick users into believing they can obtain free game-related items, which is a common social engineering tactic. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or scam campaign.

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/free-robux-vouchers-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/free-dominus-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-roblox-templates_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-hack-coin-master-game_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coalesce-roblox-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-on-roblox-meep-city_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-someones-roblox-account-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-hack-2021-android_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/mcpe-optifine_GM479516143.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_off00002cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CC2 22168 bytes
SHA-256: 04150a068ed8b575bb45aa6411e69f8e09da583261d711b125e3c3121127d12e
font_01_sfnt_off00005df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF3 19016 bytes
SHA-256: 737ab734d7fdde6242d21d62abf01a5df201bd198e5ee1e2f441e466f7bbcdcd

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