Malicious PDF — malware analysis report

Static analysis result for SHA-256 838830841ac0757a…

MALICIOUS

PDF

34.3 KB Created: 2021-07-08 15:52:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9dd02cc2cca86eeb2c06c4efb8e69ac1 SHA-1: 45ddd490fccf3bb1d17832535d822d415f6a0e5b SHA-256: 838830841ac0757a6377af41b3cd16039c68ee31c6fa617acde2ca5d6721d71a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/431946152/how-to-get-robux-without-paying-game-hack PDF link annotation
    • https://perpustakaan.stifar.ac.id/repository/easy-hack-method-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/hack-roblox-lumber-tycoon2_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/android-fast-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/download-hacked-fersion-of-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-get-free-roblox-legally_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/rc7-roblox-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/my-wife-hacked-my-roblox-account-when-i-was-sick_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/may-2021-best-free-roblox-exploit_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/earn-free-robux-by-installing-apps_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/cheats-for-roblox-vehicle-simulator_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/roblox-cheat-engine-use_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/heists-2-hack-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/best-free-exploit-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_off00002f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F6B 21828 bytes
SHA-256: a4fcc805a825942851bcea5e00cb70014abe1075f29a01f6716c9b00acfb378a
font_01_sfnt_off00005f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2C 19640 bytes
SHA-256: b958bc447a30ec836123bc526a3b4ecbe8396ef96e60ce6f4ab97b349638648c

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