Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f4752250b9aa77…

MALICIOUS

PDF

31.7 KB Created: 2021-07-05 13:36:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ef2ed734e1e14f01fa1beadf9f569103 SHA-1: dc0f3a2f40e4b65e7984ea0133891f0c7e6bb4c2 SHA-256: a7f4752250b9aa7786939c2af7ca3e7f1a70003dca337142484a0195cfc06a3e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'Coin Master Hack'. The embedded URL, http://netcdn.tw/app/406889139/coin-master-hack-ios-without-verification-game-hack, is identified as malicious infrastructure. The document body also contains this URL and other links related to game cheats, reinforcing the lure. While no scripts were extracted, the primary attack pattern involves social engineering via a malicious link within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 3

  • 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.
  • 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/406889139/coin-master-hack-ios-without-verification-game-hack In PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/free-noob-clothes-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/roblox-free-name-changer_GM431946152.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/free-roblox-face-anime-girl-blushing_GM431946152.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/coin-spin_GM406889139.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/tiktok-free-views_GM835599320.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/how-to-be-sponge-bob-on-roblox-free_GM431946152.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/roblox-pics_GM431946152.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/roblox-online-free_GM431946152.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://elearning.man3sumbawa.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3454 23192 bytes
SHA-256: bcd93917f7dd570d62658c51365f06adea719466ac5cc3a98490a072478f38ad

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