Malicious PDF — malware analysis report

Static analysis result for SHA-256 22103bf7c8ee805e…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 22:59:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: db341ba3fa0a69384ef93943905d3d59 SHA-1: a0dfe0764faf8132eea216c8a3999f47aa76b144 SHA-256: 22103bf7c8ee805e7a2dfe58e271fb8026aa0c367e0a5bdddef6d64606564f25
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a lure impersonating Facebook, directing users to a malicious redirector URL that promises free game items. This is a common tactic for credential phishing or to download further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/479516143/free-minecraft-shaders-game-hack.
  • 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/479516143/free-minecraft-shaders-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-latest-mod-apk-free-download_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
stream_004_off00005498.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5498 26660 bytes
SHA-256: e9cc7cb36d61578c651da9d4aa3b345c8113ef68bcad6e32f60f1b98ae2a5d75
font_01_sfnt_off0000902b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x902B 17908 bytes
SHA-256: 35d3f4bf4307bd8a3f315663bc97638986f3fc82832bfbc69b2a41c23e708d7a

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