Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81a5f87d12b3321…

MALICIOUS

PDF

227.8 KB Created: 2021-07-04 09:21:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ad287960b8cc11e367ac9a0c2fe7f055 SHA-1: 34e9a9572403415244cdfd0e09f1b9f8639f9529 SHA-256: c81a5f87d12b33210d19bb9ef7c843879cb683c361d0823c9f92b1313b03d1ef
250 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating a lure for free game hacks and generators, which redirect to malicious infrastructure. It also displays a fake CAPTCHA and a visual download button, aiming to trick the user into executing further actions. The primary IOC is the redirector URL found in the document.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 7

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://netcdn.tw/app/1094591345/pokemon-go-free-619-game-hack In PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/cheat-codes-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/robux-hack-no-human-verification-or-download_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-yin-vs-yang-cheat_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/how-to-get-free-robux-on-bux-gg_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-spins-coin-master-november-2021_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/roblox-cp_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-robux-hack-pro_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/7-year-old-roblox_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id/repository/free-escape-obby-for-roblox-game_GM431946152.pdfIn PDF document text
    • http://lib.teknik.unimal.ac.id//repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.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_023_off0003232e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3232E 25576 bytes
SHA-256: b4badf8772d627d19ef98bd5895dc79d2220c40356c1483d8ec6150b220356eb
font_01_sfnt_off00035f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35F2C 18796 bytes
SHA-256: c072bcd0cf30efcc88ba1a7bee32aa03f5beac664cdc4f73d595f156692f6416

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