Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f9117e0e0a820c…

MALICIOUS

PDF

46.1 KB Created: 2021-06-04 08:52:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6825c0851e8f7b1330c5a1ca354dda0c SHA-1: c4f80283085d3e0cfea3d5c3eb82f0f93d95c48e SHA-256: 81f9117e0e0a820c57e02d0a6eef383703756e067b781af77aaa5fb4ce6b7c80
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as free game hacks and promo codes. The ML classifier also flagged this PDF as malicious. The primary attack vector appears to be luring users into clicking these links, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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/1094591345/promo-code-for-pokemon-go-free-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-human-verification-and-no-survey_GM431946152.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_off00005043.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5043 24564 bytes
SHA-256: b6aae4606718abe9d3c2cde5b54d32881714a48305dba254a52a570e3fe38150
font_01_sfnt_off0000888e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x888E 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9241 18016 bytes
SHA-256: f88665f0a6fbd2288536caa78c0cd4bb5dc4e7eb579a6c1ada31136cffd6cbd6

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