Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaead0b905480213…

MALICIOUS

PDF

35.7 KB Created: 2021-07-08 17:10:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c65a1bebc7a91acaddb64fe16d697d2a SHA-1: 1db33755a063f3b6fe92a50bb37c31655c7f6fe5 SHA-256: aaead0b9054802136a65aa6e2b880c764e298e033b41dd6896fb4c87fcfa038b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains numerous links designed to lure users into clicking on offers for free in-game items and currency. The primary link directs to a known malicious redirector, and the document body is filled with SEO-optimized links to other PDFs hosted on similar domains, suggesting a link farm designed to distribute malware or facilitate scams. No scripts were extracted, but the structure and embedded URLs strongly indicate a phishing or scam attempt.

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/406889139/free-spins-on-coin-master-without-human-verification-game-hack In PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/cool-roblox-skins-that-are-free_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/roblox-flee-the-facility-computers-cheat_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/freespinandcoin_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/pubg-uc-price-in-india_GM1330123889.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/win-free-robux_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-robux-not-a-scam-or-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/before-the-dawn-roblox-free-play-online_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/pokemon-go-free-90-fps_GM1094591345.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_off00003307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3307 23092 bytes
SHA-256: 4fff097fd80c5dd62427d2da957926390e4b27af9e87d0942c29bea4498284e9
font_01_sfnt_off000066b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B5 19072 bytes
SHA-256: 27ae5e168144f9143b4eb17c336d82063430b57a560ff005ec1c031da73db6d2

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