Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca8e86e493977a3…

MALICIOUS

PDF

46.4 KB Created: 2021-06-04 02:11:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b275833323b292eeb8b063031444fbda SHA-1: f5d885694cc76542c5be6a3db9cceaf03931a183 SHA-256: 3ca8e86e493977a3fdf53bd226b3e34b712ab25eb4693cb0b8dfc7ae1601d5ea
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on "free generator" or "game hack" related content. One critical heuristic identified a link to a known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.online/app/431946152/free-robux-games-that-actually-work-2021-game-hack In PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-generator_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-daily-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/free-coins-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/coin-master-2021-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id//repository/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.wdh.ac.id/repository/how-to-get-free-robux-without-human-verification-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
stream_004_off00005284.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5284 26012 bytes
SHA-256: b572b3912430a92ca2b8befa2b4aac7850a3e58972617fc6ca31b0d8ab10a880
font_01_sfnt_off00008e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E71 19796 bytes
SHA-256: 825df7cf396e8d9c124972fb8483e304b72a256d7e3507e7d5ad5df48b88867f

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