Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c973a94f8cc97b…

MALICIOUS

PDF

33.4 KB Created: 2021-07-05 23:09:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d6ed36264bd3bca745c42ec0ca1bee1c SHA-1: 69dae27af564bf2c6e441aa55213f726d31c3ce9 SHA-256: 29c973a94f8cc97be2f3deac4a4a6d25710778583f1a01c9b1da06305008f470
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free generator / game hack'. The document body and numerous extracted URLs reinforce this lure, pointing to sites offering game-related cheats and currency. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the primary attack pattern involves social engineering via a deceptive link.

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.tw/app/406889139/free-coin-app-game-hack In PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/roblox-free-jailbreak-vip-server_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/pubg-uc-hack-online_GM1330123889.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/robux-premium_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-parris-island-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/robux-online_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_002_off00002f37.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F37 22172 bytes
SHA-256: 9d8e1e25fbab193a6132a59438f3735cf74f12d0106db5df8d209cbeb5495976
font_01_sfnt_off00006068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6068 18068 bytes
SHA-256: 618b80e77a136fe63dd8e2815e3b2102d4d8bd2c3a933595298dbc9f70fabcc8

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