Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec6129b5c7d9b80…

MALICIOUS

PDF

35.1 KB Created: 2021-06-29 21:16:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 218d0db6bcf8ca91e12655f8f20a851e SHA-1: dc0502559f9c17500e31856887b9c74a95513469 SHA-256: 3ec6129b5c7d9b804a34b05a2c6983ad64ca6da2dfdc6cb2ac0ee86c62678fc3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body explicitly mentions 'Free Robux Codes December 2021' and includes the malicious URL, reinforcing the phishing attempt. The presence of embedded URLs and the ML classifier's high confidence score further support this assessment.

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/431946152/free-robux-codes-december-2021-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-time-hack-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-admin-hack-download-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-sell-a-shirt-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/denisdaily-exposing-a-roblox-hacker-wild-revolvers_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hack-it-all-challenge-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-ame-cheats_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/foxyhackscom-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/get-robux-today_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-for-free-no-robot_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/joshy-roblox-hack-virus_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/rbx-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coinmaster-spin-ml_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_off00003098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3098 22200 bytes
SHA-256: d6fbf378083b0ed45207d9343581a66cc3688ca04f2c03f85aabc78fa61d6fbd
font_01_sfnt_off000061e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E8 19720 bytes
SHA-256: b303a966aca679f000738f254913402c2e603929d7f34b97ceef80ccbaefb26a

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