Malicious PDF — malware analysis report

Static analysis result for SHA-256 98593efb0b0c287b…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 20:27:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0c72b7d605cdfc5db1138f3635e9f394 SHA-1: a23385523568ee68f2e6ca3251119704b2168f84 SHA-256: 98593efb0b0c287bb8f6cc8290ff67f81b80254f2fec7cadf6ae2a72c14a4301
260 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and download lure to trick users into clicking malicious links, such as the one pointing to 'http://netcdn.tw/app/479516143/minecraft-story-mode-free-download-game-hack'. The document also contains a large number of links to other PDFs hosted on 'lib.stie-aub.ac.id', suggesting a link farm designed to distribute further malicious content or engage in SEO poisoning. No scripts were extracted, but the presence of embedded URLs and the fake CAPTCHA heuristic strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/479516143/minecraft-story-mode-free-download-game-hack In PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-free-online-play-now_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/console-hack-free-hats-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hacks-roblox-pc_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-prison-life-hack-mac_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hacking-system-for-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/get-a-robux-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/best-free-roblox-outfitas_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/rbxfree-com-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/new-oilgarchy-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robux-free-net_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/pubg-74-uc_GM1330123889.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_off000031ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31EE 22768 bytes
SHA-256: 51ba1ed1d18be35ae01d4a1d3c8ea4278f1c31298835415c262f14f6dfa08737
font_01_sfnt_off000064e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E5 18760 bytes
SHA-256: e9e1fef330823a40f58c60832c4229904102633f954732c5db6da758049cb8f7

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