Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c70c4533319068…

MALICIOUS

PDF

44.4 KB Created: 2021-06-13 17:16:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9534fcca263942d7e2bbccfa54c5838d SHA-1: d5722b78ef821104a659a9c169591520dbaa3729 SHA-256: 86c70c45333190687d270c7375708a6c6c09eb6fcd758751321269d1b8ef0923
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and links to known malicious redirectors, aiming to trick users into downloading a payload. The embedded URLs, such as http://netcdn.co/app/431946152/hack-roblox-jailbreak-espaol-game-hack, are indicative of a phishing or malware distribution scheme. While no scripts were directly extracted, the PDF structure and heuristics suggest an attempt to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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
  • 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.co/app/431946152/hack-roblox-jailbreak-espaol-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-vip-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/pokemon-go-free-download-apk_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-supreme-roblox-model_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-dinero-en-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/get-free-coins-for-coin-master_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
font_00_sfnt_off00005218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5218 24340 bytes
SHA-256: d2453614e085c4a2f151360f05d8949c50835ad45801597c44a6633c11c0af03
font_01_sfnt_off000089e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E5 18644 bytes
SHA-256: c42537bac4a76277598fcaba8a6f8eb98a0f714048f3718af6339f0928c02a9b

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