Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d7f5eb43f4765c…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 15:21:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e16bd2906c863ffcacbfbe07c123103d SHA-1: 9f6fe4d6d685006c72e910414bdbf47edbe4ca84 SHA-256: 94d7f5eb43f4765ca3f1c059c0cfdee95a89eb0301279fd135040f55703818e2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on them, promising free game currency or hacks. One critical heuristic identified a link to known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/get-free-spins-coin-master-game-hack. The document body and embedded URLs reinforce this lure, suggesting the primary goal is to redirect users to potentially malicious sites for further exploitation or malware delivery.

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/get-free-spins-coin-master-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-run-roblox-hacks-on-school-pc_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-roblox-to-get-money_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-do-you-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-tbc-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/mcpe-client_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/comment-hacker-roblox-pc_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-codes-for-free-stuff-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/joshy-roblox-hack-virus_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-free-hack-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-war-games-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-xlothroblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-you-get-free-robux-on-roblox_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
font_00_sfnt_off00003310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3310 22896 bytes
SHA-256: abc388c7bb338c6a46bf65b882e94ecddbbe423f48dd081b2bfa9fa80fd6d4b6
font_01_sfnt_off00006631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6631 18176 bytes
SHA-256: 4615fa8d24c7ab701dc83bbe602e927cac2a2c7f7d4d6f21c8af2f2227b09e12

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