Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25ab8552135d1b0…

MALICIOUS

PDF

48.3 KB Created: 2021-06-04 00:17:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f9fd0259fbc7ce9c328de98f6101433c SHA-1: b82e3210ae90f62ba9e5ff79be4d1833ebc81515 SHA-256: e25ab8552135d1b0730c7a45f28f6718baed61c8488786825bd623e67c4b3c3f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector infrastructure, specifically advertising a "coin master free link 2021 game hack". This indicates a social engineering lure designed to trick users into visiting potentially malicious websites. The presence of embedded URLs and the ML classifier's high confidence score support this assessment. No scripts were extracted, but the document's structure and embedded links are sufficient to infer a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/406889139/coin-master-free-link-2021-game-hack In PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-pe_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52EB 25452 bytes
SHA-256: da80a45dd45724e62fe25a1d4df41cab5338360694cac70729261884f7744eaf
font_01_sfnt_off00008c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6F 4020 bytes
SHA-256: 7d3617ecf51e14e6cffc9372c4441988c3b6cb3ea010f7512aee6af842ef388d
font_02_sfnt_off000099fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99FA 18284 bytes
SHA-256: be459003f2db1a934c49859962f2962ce704e042ee0985c73311b64c11e09449

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