Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1861515530d61c…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 09:34:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bc11b2a3e71c75ee71475e7c11d2abff SHA-1: 19909ee68f644ea7a5ac125317d4b0551b91127f SHA-256: 1b1861515530d61c495629f573a85b7c26f7b4964c69b9c70d644c2204962c29
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as a 'free generator / game hack'. The primary URL, https://netcdn.online/app/406889139/coin-master-15-free-spin-link-of-last-5-days-game-hack, is likely used to deliver a second-stage payload or redirect to a phishing page. The document's structure and embedded URLs strongly suggest a social engineering lure to entice users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/coin-master-15-free-spin-link-of-last-5-days-game-hack In PDF document text
    • http://perpus.polbitrada.ac.id/repository/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/roblox-pics_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/pubg-uc-price-in-india_GM1330123889.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/tiktok-free-view-iphone-7-plus_GM835599320.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_off00004fee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEE 24104 bytes
SHA-256: 1012913955018c18740dc91aa8861748db44c467a17d66fde7dbe50a4e4319e2
font_01_sfnt_off0000871c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x871C 18644 bytes
SHA-256: 4144dbe1534d0325d37e4c6129895ddb34a2bc26123e242025982d4ceef1bd2b

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