Malicious PDF — malware analysis report

Static analysis result for SHA-256 3515ed09fb235c24…

MALICIOUS

PDF

32.5 KB Created: 2021-06-25 05:38:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8acd58ebe5364890e385fc8d17c74fbf SHA-1: 74402bd8ff0cce4a29eda86a878c82a2e4435d69 SHA-256: 3515ed09fb235c24071d685ffcdabd61e8eb9e5d39145548005a83cf6b3fbf42
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing a 'free game hack' pretext to redirect users to a link farm. The document contains numerous URLs pointing to other PDFs, many of which are SEO-optimized and likely serve as gateways to malicious content or further phishing attempts. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the document's nature as a link farm designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.co/app/431946152/roblox-character-boy-free-game-hack PDF link annotation
    • http://www.khneisser.ch/uploaded_files/userfiles/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/getrobux-info_GM431946152.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/roblox-how-to-hack-with-ceat-engine_GM431946152.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/pubg-uc-no-human-verification_GM1330123889.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/dress-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/roblox-imagine_GM431946152.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/pro-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/easiest-money-hack-febuary-roblox-rocitizens_GM431946152.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/free-roblox-items-for-1m-instagram-followers_GM431946152.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://www.khneisser.ch/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-2021-easy_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_off00002a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A4B 21708 bytes
SHA-256: b20f38962f50f388603fb72b3f156e27fbac0785e731c4c071f29c14b714f9ac
font_01_sfnt_off000059fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59FD 19100 bytes
SHA-256: 032639805bc7986cc7c3f11eb3c7cca038d1ad9a34f80aa01bd848c50b434b26

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