Malicious PDF — malware analysis report

Static analysis result for SHA-256 c788d4f1b653b5d4…

MALICIOUS

PDF

35.3 KB Created: 2021-06-28 01:04:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4623e3b04fc121e1afd3e11c1c5cac88 SHA-1: 23cd60083586469dc4ec8e5a75cc7c7fd8c86f68 SHA-256: c788d4f1b653b5d43c42dc3d92807d251cedbdf4a9d20fdc5b337102d62d7754
220 Risk Score

Malware Insights

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

This PDF document employs a common lure of free in-game items to trick users into clicking malicious links. The document contains numerous links to external PDFs and a primary redirector URL, indicating a phishing or malware distribution scheme. The ML classifier strongly supports the malicious nature of this PDF, and the presence of multiple redirector links suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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/how-to-get-free-clothes-on-roblox-inspect-game-hack In PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/i-will-hack-and-not-kill-parent-fashion-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-hack-roblox-and-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-do-u-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-easy-december-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/oneapprewards-com-roblox-hack-robux-picker-sessid-4s45w24_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-2021-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-hacks-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/kaio-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/what-cheats-can-you-do-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/all-minecraft-handbooks_GM479516143.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_off000032ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32EC 22324 bytes
SHA-256: 1ddfa4427c6048170471bdeb6e707b7062a21694ca3a402f8df10fdf0a7f4b80
font_01_sfnt_off00006477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6477 19260 bytes
SHA-256: f44d85a877c22048a3c3f6d50771b5188a9d3cc5b0bdcdb80ec2de6d41a4d1cd

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