Malicious PDF — malware analysis report

Static analysis result for SHA-256 43587f69a29314bc…

MALICIOUS

PDF

45.0 KB Created: 2021-05-14 00:09:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 51ce99c3a47a2602665ca3724725d17b SHA-1: c074bd5eb7cbf4dad90df4ae489cf90e305fb8ce SHA-256: 43587f69a29314bc2caaa2f22e84ccc260d4a9d6c237fdda3a0a61d78b5727c1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary redirect URL is https://netcdn.xyz/app/406889139/daily-free-spins-coin-master-2021-game-hack, which is flagged as a known malicious redirector. The document body and embedded URLs reinforce this lure by referencing popular games and free item generators, aiming to trick users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/daily-free-spins-coin-master-2021-game-hack In PDF document text
    • http://www.bripi.pl/images/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/corn-master_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-spin-and-coins-links_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_003_off0000494f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x494F 24448 bytes
SHA-256: db9fde0ea5254ef73442a4069341cc853e97a4ad2e5479765a903be419d5f694
font_01_sfnt_off000080f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80F2 3124 bytes
SHA-256: 9967c6221325a4ff3f7c4336922605f990450164c2eee2df708cc81823c6ec98
font_02_sfnt_off00008bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD1 18708 bytes
SHA-256: 76af36f54327e394f6a0995f5c1804c6d580e71cb7eebf938ec25838add40309

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