Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec730fbf1c2fa5d…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 12:04:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d5e9b356d5bf3b57a0289c0d281b4e5c SHA-1: 1384c8b35b5eb24c35d9f59426183742af9c0ecf SHA-256: 7ec730fbf1c2fa5dffaca86e8f9714b6a5c24d935482074471cf706571ab2a48
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free in-game currency to entice users. It contains numerous links to external PDFs and a primary redirector URL, indicating a link farm or redirection scheme designed to lead users to potentially malicious content. The ML classifier strongly flagged this PDF, and the presence of multiple critical heuristics related to malicious redirectors and link farms supports this assessment.

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.tw/app/479516143/minecraft-survival-hacks-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-re_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-in-inspect_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-hack-2021-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-face-rig_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-today-easy_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/hacks-in-the-roblox-chat_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-minecraft-java-edition_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_off00003197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3197 21844 bytes
SHA-256: 1fc69503f5b1c1355d35c07a45520dc083d61a2a089e6dc1b50ceb985e2699e6
font_01_sfnt_off0000616f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616F 18356 bytes
SHA-256: 3f8c07b70f743712d3b4317b18b553f1a7ae77b3390c9655d2aa42ba9c2140cb

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