Malicious PDF — malware analysis report

Static analysis result for SHA-256 476a77d3d684709c…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 08:03:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e17b38d4b35e081db24a607d76824157 SHA-1: 1726a0b8c1acce76bd23199c949a35cb4ff15a1b SHA-256: 476a77d3d684709c4745042dee34cf34be01dd64c13dfb625d9e1fae521e058b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/coin-master-hack-2021-download-game-hack PDF link annotation
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/hacks-for-roblox-kat_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id//repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id//repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-easy-robux-vortexx_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id//repository/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/roblox-aimbot-dll-hack_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/hack-to-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/free-roblox-accounts-new_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-clothes-on-roblox-iphone_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/how-to-get-roblox-hack-for-apocoleps-rizing_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/free-cam-script-roblox_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id//repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/downloading-roblox-link-free-like-no-money-needed_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id//repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://digilib-ppkn.stkip-pgri-sumbar.ac.id/repository/how-to-hack-a-roblox-account-back_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_off00003114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3114 22948 bytes
SHA-256: cf5bc86b1e0f447128027758130d8b86fd4fb849c2afbce0f641a27cbe26e0c5
font_01_sfnt_off0000646e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x646E 18988 bytes
SHA-256: af951b1633a2787412a9a702c9754db5e3271a3175a3f5193121ef3c3d99dea6

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