Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4f285594ed939c…

MALICIOUS

PDF

47.7 KB Created: 2021-06-04 03:18:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d381514ade643061adf5c3f93722cb77 SHA-1: 23f10f6496a8db028e559e953593b85baf80f5e7 SHA-256: aa4f285594ed939c8c6c61c8f5aa36f7ff0c962f624b949275c0c0aea93ff862
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to a site offering 'free Robux' via a game hack, a common lure for phishing or malware distribution. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the presence of malicious redirector links and the lure suggest the document is intended to lead the user to a compromised site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/431946152/how-to-get-free-robux-on-roblox-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-online_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-redeem_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-116-free_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-tool-ios_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/como-hackear-coin-master-en-espaol_GM406889139.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_off0000516a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x516A 31312 bytes
SHA-256: 450972b718ed030dc02ede6e40eaa2ed5570352450ccbe7b978a08e54307804a
font_01_sfnt_off000097be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97BE 18356 bytes
SHA-256: 07f7f5fe088ebb6a81b9aca0d3b7acb37488304f642f9e675d153fcc87cea6c5

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