Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad82dfbf281df249…

MALICIOUS

PDF

35.4 KB Created: 2021-06-25 20:00:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0a010f7de0fedacdc5bb7343c3081b45 SHA-1: 2a2da669533c17c061d878cb7548e0290453bbff SHA-256: ad82dfbf281df2496b3068a43113eddd3a2f23522aefee484f57480f1ca5cd78
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game items and hacks to entice users. It contains numerous links to external PDF files hosted on what appears to be a link farm, and also directs users to a malicious redirector URL. The ML classifier strongly indicated maliciousness, and the heuristics confirm the presence of a link farm and malicious redirector infrastructure.

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.co/app/431946152/free-account-giveaway-roblox-2021-game-hack In PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/tiktok-free-view-your-liked-videos_GM835599320.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/roblox-hack-download-pc-booga-booga_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/level-coin_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-no-task_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/hack-stealing-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-cheat-in-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_off00003033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3033 22852 bytes
SHA-256: 25b8067f2fe5fbb7441d05fc20c9c54d108a9de20f056d7b3f394d3a818dfdcb
font_01_sfnt_off000062b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B9 19872 bytes
SHA-256: 20aa7a185d749a0691079f4ea841eb0446ad152eeda7f7039287779bede21c94

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