Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c8cdee48c11eed…

MALICIOUS

PDF

35.0 KB Created: 2021-07-07 14:49:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4ab738579ddc4301bb81d5817a1af894 SHA-1: 7ed1cb69f348edffd7ce87c33ce17427d46230b3 SHA-256: c7c8cdee48c11eedfc8b5d646d55fb31138ffcdce3733101bce7b206a2e017ed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary redirect URL is http://netcdn.tw/app/431946152/ways-to-get-free-robux-2021-game-hack. This indicates a social engineering tactic to trick users into visiting potentially harmful sites. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect users.

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/ways-to-get-free-robux-2021-game-hack In PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/dark-fog-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/roblox-robux-hack-generato_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/daily-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/javascript-robux-free_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/roblox-free-printables_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/how-to-hack-one-death-run-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/free-week-old-accounts-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/robux-hack-image_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/inject-hack-roblox-code_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/how-to-get-free-items-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/free-spin-link-for-coin-master-game_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_off00003190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3190 21852 bytes
SHA-256: bb1c1608f3b1681306918e4485ab54c22984c024e114cecf2399b9f09fe81f06
font_01_sfnt_off000061cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CD 19600 bytes
SHA-256: c00d54827bcee88cdbe96b013b7ed3ba2b531ed1e4e5548e429b871c3375097c

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