Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4558ae1858f34d…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 05:41:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fa86a58b9ba31ea6e4da7dc4ae215ec0 SHA-1: 3913f59167f45d1ad2191da17bf84d65ced655d9 SHA-256: da4558ae1858f34d905d54bec8421b4b1cc2f48193ee7690c038bc96330ad30c
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains links to malicious redirectors and displays a fake CAPTCHA to trick users into interacting with the content. The primary link, https://netcdn.online/app/431946152/best-free-roblox-outfits-game-hack, is associated with game hack lures. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.online/app/431946152/best-free-roblox-outfits-game-hack In PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/tiktok-minecraft-hacks_GM479516143.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
stream_004_off00004f28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F28 27480 bytes
SHA-256: e1ae6900f277aa8b92870e014f8ce6a039ca9d0c679825741bc33547bdfb8ce5
font_01_sfnt_off00008d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D37 18312 bytes
SHA-256: 89512dfdf3c32327c0db45e2d9e4fd6bb6ee2008311dd83cdd60df0af13f88f9

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