Malicious PDF — malware analysis report

Static analysis result for SHA-256 835068f548ab4c1a…

MALICIOUS

PDF

34.5 KB Created: 2021-06-19 15:01:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8a8c5e9b99d39e959644f261eb56984c SHA-1: 95c17061d2baf16fcfc9c54d2e88521703c42b66 SHA-256: 835068f548ab4c1a6c2de340b0f25408121ac2bd4b8a09969ee199ab44e70417
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector hosted on netcdn.co, which is flagged as malicious. The document body and embedded URLs suggest a lure for game hacks or free currency, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection, likely leading to further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/406889139/free-coins-and-spins-coin-master-game-hack In PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-daily-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/roblox-speed-race-hack_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-20210-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-free-robux-in-a-game-in-roblox_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/dog-roblox-free-costume-make_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/bleu-roblox-mega-free-2021_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/claim-roblox_GM431946152.pdfIn PDF document text
    • https://repository.stikesindramayu.ac.id/repository/how-do-you-get-free-stuff-in-roblox-2021_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_off00003235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3235 22440 bytes
SHA-256: f10d25e0d6233f81fe8a0031b7b320b14ee85c0c770bfcfecd2085695166895f
font_01_sfnt_off0000641a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641A 18348 bytes
SHA-256: c90f632020bcb1e728f62a43997badda2860e0d329262e99dedc1f8a12c39115

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