Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d4d3acb898955f…

MALICIOUS

PDF

33.2 KB Created: 2021-07-20 06:53:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0b602fcda0c5237376705dab2423617c SHA-1: 4e06ac6140bb9fc523c71fe8536ec97862b9d2a9 SHA-256: a7d4d3acb898955f6441870f85e816cb6aef99503f1495302eb100a96ec704fa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links and embedded text that lure the user with promises of free Robux and game hacks. These links redirect to malicious infrastructure, specifically http://netcdn.tw/app/431946152/claim-free-robux-game-hack, which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and content point to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/claim-free-robux-game-hack In PDF document text
    • http://elearning.mtsn3majalengka.sch.id/__statics/gudangsoal/files/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn3majalengka.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3majalengka.sch.id/__statics/gudangsoal/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn3majalengka.sch.id/__statics/gudangsoal/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn3majalengka.sch.id/__statics/gudangsoal/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3majalengka.sch.id/__statics/gudangsoal/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn3majalengka.sch.id/__statics/gudangsoal/files/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn3majalengka.sch.id/__statics/gudangsoal/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3majalengka.sch.id/__statics/gudangsoal/files/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn3majalengka.sch.id/__statics/gudangsoal/files/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B61 22700 bytes
SHA-256: 4e86c3602495fa3d9d1ff71aa5e60f777c2523ad080deb0faba11e30a2c691c8
font_01_sfnt_off00005e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2A 18884 bytes
SHA-256: ae76db074a4b7bd0cf2df4b3c3d771d873f937dbbe8778acf7ef920e6df55ea5

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