Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95ef8bf808eb092…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 15:04:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a8cf885b049d032c90f85a537f852ae2 SHA-1: e855e3905bbb2c58ba64b92967ca358cb28a6c3a SHA-256: f95ef8bf808eb0925c70de16b092df8faed6dbc8fe69f31cf15a97b20d7ccf7b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including a primary link to a known malicious redirector, disguised as a 'free generator' or 'game hack'. The document body and heuristics indicate a lure for free in-game currency or cheats, likely leading to a phishing site or malware download. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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-no-offers-game-hack In PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-free-robux-without-builder-club_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/noob-vs-pro-vs-hacker-vs-god-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-roblox-exploits-like-synapse_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-game-dev-life-free_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-studio-free-download-windows-10_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-download-apk-pc-free_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-use-speed-hack-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-anything-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/cracked-free-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/all-might-roblox-free-shop-t-schirt_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/free-tiktok-followers-instantly_GM835599320.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-free-glasses_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-hack-mad-city_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/roblox-hack-apk-2021_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-the-roblox-madness-face-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://digilib.widyagamahusada.ac.id/repository/baby-simulator-hack-roblox_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_off000030b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B2 21924 bytes
SHA-256: 61039d30e01ad2572d99343ded8918eb7de34bdb518c68e0dce168cd3abf0378
font_01_sfnt_off0000610f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x610F 18716 bytes
SHA-256: 6cef72b87605a464df8901898d024a902d738decefc8e487a7362df6534fb924

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