Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe3f3af8b4ae7d4…

MALICIOUS

PDF

48.3 KB Created: 2021-06-11 06:56:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ea890438b3cd57e5e912207b55cefad6 SHA-1: 9e9e54b3362db7a2f886f9144fc237c183514d5e SHA-256: 1fe3f3af8b4ae7d43ef7bef7fb20fadb077c6b9c02f09a626b9012fcc0145c97
260 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure designed to trick users into clicking a link. This link, 'https://netcdn.tw/app/431946152/roblox-free-dominus-generator-game-hack', redirects to malicious infrastructure. The document also includes a large number of SEO-optimized links, many of which point to other PDF files, suggesting a link farm or content-spinning operation to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/roblox-free-dominus-generator-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/wearedevs-roblox-exploits-and-hacks-amp_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-picture-verification_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-sued_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/cheats-para-ben-10-universal-showdown-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-game-for-pc-free-download_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_004_off000053bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53BB 25572 bytes
SHA-256: 23b4b48b81be882314206a9000e10b92e9612b567b4561491699e4d909e39f51
font_01_sfnt_off00008e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4A 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000097fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97FB 18968 bytes
SHA-256: e9db0b14df31ba8cdceacde88736f6e4bcf36bfef1b6951a102517ba13215cd8

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