Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4403055a2e0ff3…

MALICIOUS

PDF

34.2 KB Created: 2021-07-09 10:24:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6b7bdfa28f999af1f2cb3e471fe56d57 SHA-1: be444ffb5ae8952feabf4f4537d785f11ec2dfdd SHA-256: 7b4403055a2e0ff3c7d30607ec988b15891587451f1a7ac7fba93ebcdc70af45
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free generator' and 'game hack' lures. The document body and extracted URLs strongly suggest a phishing or scam attempt to trick users into visiting malicious sites. No scripts were extracted, but the PDF's structure and embedded URLs indicate a malicious redirector workflow.

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-as-a-kid-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-today_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/unlimited-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-cheat-download_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/get-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-draw-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-free-download-mac_GM479516143.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_off00002dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DFE 22428 bytes
SHA-256: 87fdb07f5ac1d6bfc1478cef9fcad1824d49694e50d4749cbabebcebd7dc04c2
font_01_sfnt_off00005fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD6 19280 bytes
SHA-256: fbd482d3b42c402f31899b7174a93de7a7aa833796ffa593885741fefeb30eca

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