Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5d5b1e84d2dbff…

MALICIOUS

PDF

35.7 KB Created: 2021-07-08 05:39:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d563227d521b254828a9841a6e1a1896 SHA-1: b0b9f38b6fb8953cc8c93dd83b22bc5503df56c3 SHA-256: 4a5d5b1e84d2dbff554afd2addf8b11a6bc2cf5bbce1cf47cd0ec22386248672
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a prominent link and text related to 'free Robux' and 'game hacks', directly luring the user to click. This link, http://netcdn.tw/app/431946152/how-to-get-free-robux-2021-game-hack, is identified as a malicious redirector. The document's structure and content strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

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-free-robux-2021-game-hack In PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/coin-master-hack-no-verification-ios_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/big-paintball-roblox-immortal-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/robux-hack-with-required-password_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/free-rare-cards-for-coin-master-christmas_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalyusra.sch.id/__statics/gudangsoal/files/roblox-hack-tix-and-robux-generator-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_off0000327d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x327D 22736 bytes
SHA-256: f17f689ae8cff5572c7ad1e6a1d12cf8ce7440c8f67e88ed6d0e9cad7f4a9bbc
font_01_sfnt_off00006538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6538 19384 bytes
SHA-256: 140efaa19506918d6e23c6f72929d04436b836b18eb9dc717a4a442c24a9fe38

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