Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0855eed725efd2…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 19:20:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d09221cbf9cdfcef5bee759957874b95 SHA-1: 685d9ff406683e0a01746c947841686119d90956 SHA-256: ca0855eed725efd2687bfac0ab8d5fc0d31b21ec6a6c1b902b0e3e678c586a06
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, masquerading as a 'free generator / game hack' lure. The document body and heuristics indicate a strong attempt to drive traffic to these malicious URLs, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are highly indicative of a malicious lure.

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/431946152/free-robux-just-click-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-cheats-and-hacks-no-download_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-real-no-fake_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-gat-robux-for-free-ona-webcite_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-any-gamepass-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-all-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-put-iny-hack-on-any-roblox-game_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/tiktok-free-movie-website_GM835599320.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/inspect-element-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-old-roblox-acocunt-giveaway-pastebin_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-unicorn-code-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-all-the-clothes-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-free-excutor_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/pubg-uc-exchange_GM1330123889.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/best-robux-hack-2021_GM431946152.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_off00002f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F0E 22248 bytes
SHA-256: a8a55b0a0c1c30dbf0533d00da7427801747d6c082d2491b9a68bf76c49fd8a8
font_01_sfnt_off0000603b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x603B 19348 bytes
SHA-256: 8163eefe55d2b716894bab3fbbbe5b67835ea43b9ee71dd429e67fe46c72f214

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