Malicious PDF — malware analysis report

Static analysis result for SHA-256 16889bf0914576d9…

MALICIOUS

PDF

33.4 KB Created: 2021-07-07 08:55:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 42867476566bd415c7117d14d3a23224 SHA-1: 2076e28c915afdc63cb63d43d34a3e47c5987b94 SHA-256: 16889bf0914576d9e39caf9743ea5b498c3a42492ef77b6ca4f8ac1be98d781c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free generators'. The primary lure URL is http://netcdn.tw/app/431946152/hack-robux-game-hack, which is flagged as malicious. The document body and embedded URLs reinforce this theme, suggesting a phishing or scam attempt to redirect users to potentially harmful sites. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a malicious redirector campaign.

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/431946152/hack-robux-game-hack In PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/funny-free-roblox-t-shirtd_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/list-of-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/arsenal-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/get-free-robux-no-human-verification-real_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/guuudd-info-robux-hack_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-minecraft-com_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-make-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-shirts-pants-roblox_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/hack-any-roblox-account-script_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-free-shirts-to-put-up-for-sale_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_off00002d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D73 22064 bytes
SHA-256: e7e7f208b97f339b55d1704678f75b65f8cbc5b65691cd754f483607d0bb1814
font_01_sfnt_off00005e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E43 18724 bytes
SHA-256: 3ac7be5af293af38fa349e44a35dc9d744ccac9489df6a6de684f68f531fa54d

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