Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91b27f4126e65e5…

MALICIOUS

PDF

44.8 KB Created: 2021-06-09 16:36:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 75c7d0e88831fcac1d98ac9a423e7649 SHA-1: eb5eed4c0bb7d11dfba67c11dd75179947974ad5 SHA-256: c91b27f4126e65e515588bf6b72a27bb76bd1dc9a276ccf82639f07d4f862bb3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks or free generators. The primary link leads to a known malicious redirector infrastructure. The document body and embedded links suggest a social engineering tactic to drive traffic to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/roblox-fly-script-cheat-engine-game-hack In PDF document text
    • https://lib.unitri.ac.id/repository/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hoe-to-get-extra-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hack-coin-master-apk-358_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-mster-free_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/worst-client_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/games-like-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-games-like-minecraft_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_off00005166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5166 24572 bytes
SHA-256: 60ed32cd78f5d5b5e7820c3063dfb8914996ca72497bfc0a93200eeb74516cac
font_01_sfnt_off000089e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E1 19212 bytes
SHA-256: 09bc2fb25d195d26e28a000395f7ab0ac1b25db1566c2df3909d6b630dfb31ad

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