Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87270f46163f0f5…

MALICIOUS

PDF

44.0 KB Created: 2021-06-11 10:47:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3748b2dc2ac4496c45dacdbfd22c6a4b SHA-1: 220e77366523d6de9963dc1294d24d1f0103c6d1 SHA-256: d87270f46163f0f587930d4f77069bfed6ddb43d8bd325bdc0179ace1eb7eae8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as a 'free generator / game hack' lure, which is a common tactic for distributing malware or phishing for credentials. The document body, though partially corrupted, contains references to 'Robux' and a URL that aligns with this lure. The presence of multiple embedded URLs and the critical heuristic firings strongly suggest malicious intent, likely to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/how-to-get-200-robux-for-free-game-hack In PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/roblox-ban_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://www.elearning.mtsn2ska.sch.id/__statics/gudangsoal/files/is-roblox-free-onphones_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_off000051e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51E4 24144 bytes
SHA-256: 89115f112c6590b59864d6d644f2285bd56e7c582d63a89ec7b97a63ff2b8081
font_01_sfnt_off00008848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8848 18576 bytes
SHA-256: b7714a56a03d4e3b202b13ee3fbad8903c7805ea675656debd0dc1e310c00e17

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