Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c3fff2d8488503…

MALICIOUS

PDF

35.3 KB Created: 2021-07-01 05:09:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8bccf5a59203548b6e7f9a81d00ca198 SHA-1: afd785b2c0a550b14cbca43731e06a95037a880d SHA-256: b5c3fff2d8488503dabb54c060dd926daf0e83f534cd9ce2ebe8b0e520293879
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that lead to a known malicious redirector infrastructure, specifically advertising free game currency generators. The heuristic firings confirm the presence of malicious redirector links and a lure for game hacks. While no scripts were extracted, the document's structure and embedded URLs strongly suggest it is designed to trick users into visiting malicious sites, likely for further exploitation or credential harvesting.

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/how-to-get-free-robux-on-apple-ipad-2021-game-hack In PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/exploit-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-coin_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-roblox-items-catalog_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-robux-link_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/how-to-earn-free-stars-on-coin-master_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
font_00_sfnt_off0000306b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x306B 22468 bytes
SHA-256: 00167f34eaf90297e03d70665b368b5eb71b855ef88900f85796fcbb338a00ea
font_01_sfnt_off0000627b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627B 19812 bytes
SHA-256: 8d59f909740abaeb68b61a5a3acaca61311155a1ab9b2642c5147240a133cc55

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