Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7528bbf75bb434…

MALICIOUS

PDF

34.0 KB Created: 2021-07-07 08:22:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 214f9952a1fc3b2f48172c250a83d56c SHA-1: 56562530e877d01dc8ad62988f15d8d62a511f31 SHA-256: 8d7528bbf75bb434a377297e3044c1b576d385e6d2fa463836ffd2267ace09d9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, including a primary redirector at http://netcdn.tw/app/431946152/roblox-hack-generator-game-hack, which is flagged as malicious. The document body and heuristics indicate a lure for game hacks and generators, likely to lead users to phishing or malware download sites. No scripts were extracted, but the extensive link farm and malicious redirector suggest a phishing or potentially a downloader campaign.

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/roblox-hack-generator-game-hack In PDF document text
    • https://www.knjigebuducnosti.com/files/break-free-song-id-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/veste-free-in-game-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-codes-robux-free_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-get-free-robux-hack-on-pc_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/what-is-free-roblox-generator_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/afraid-of-old-roblox-account-being-hacked_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-tiktok-likes-no-human-verification_GM835599320.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-scythe-script-hack_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/robux-hacks-2021-on-a-hp-computer_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-old-roblox-account-new-may-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-galaxy-money-hack_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-spain_GM406889139.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_off00002db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB1 22692 bytes
SHA-256: 81e0f92209a3ec37cccbe40bbcdcbc9d0aa66a4e090514c5efd6cef1196ab749
font_01_sfnt_off00006063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6063 18760 bytes
SHA-256: b79899937f6f59d67c0cc016ae9e295c0b2eeda93cfd6b0750b290eebb9c7341

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