Malicious PDF — malware analysis report

Static analysis result for SHA-256 780e93d31693ef52…

MALICIOUS

PDF

32.4 KB Created: 2021-07-04 01:54:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 29130d4ade2c23a9e7dc96bddd8a72ae SHA-1: 069c450918e29889c8d134c280aa623e36fe004d SHA-256: 780e93d31693ef5291f4742657ca970289b3b47eae8b5fea555bbc96357e1a86
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering 'free generators' and 'hacks', including a primary redirector at http://netcdn.tw/app/431946152/roblox-hack-generator-game-hack. The document body and heuristics indicate a lure for game-related cheats, likely leading to malicious sites or malware downloads. The presence of many linked PDFs suggests a link farm designed to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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
    • http://perpus.unpam.ac.id/repository/best-meme-tshirts-on-roblox-free_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/i-just-got-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-generatorexe_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/pubg-uc-ycom_GM1330123889.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-robux-cards_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-app_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-black-panther-mask-free_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-hack-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-hack-roblox-accounts-youtube_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-hack-roblox-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-do-i-get-free-spins-in-coin-master_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_off00002a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A78 21912 bytes
SHA-256: 6eda7177820d0a368527e5fdcedb27b40f9bc69d76ecac547f5005ca3bdf41e7
font_01_sfnt_off00005a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A96 18760 bytes
SHA-256: b79899937f6f59d67c0cc016ae9e295c0b2eeda93cfd6b0750b290eebb9c7341

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