Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fea531a8ebc6d7…

MALICIOUS

PDF

41.2 KB Created: 2021-05-12 02:33:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7bcda4216060f0aacbe31e86c2d72cf8 SHA-1: 71f82ef4b424f8c21287ae33b5a2077881d307c4 SHA-256: a7fea531a8ebc6d7b134f9633a986860f779ba6172535d3ae024a925ed8e0f2a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to a malicious domain, masquerading as a generator for game currency or hacks. The ML classifier and specific PDF heuristics strongly indicate malicious intent. The document body and extracted URLs suggest a social engineering lure to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/free-robux-pin-codes-game-hack In PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/how-to-get-free-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/master-free-spin_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/free-fire-coin-master_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://pustakasma.nurulfikri.sch.id/repository/coin-master-hack-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_off00004965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4965 23364 bytes
SHA-256: cd1fd303756b7ebbdff4179c940f30f0080e27480bd8d79201b4732a1c363f7b
font_01_sfnt_off00007df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF2 18464 bytes
SHA-256: 23872266a6577b01853888d52c04c526ac323517b7f86f8cb64f3b9e81653507

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