Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cad32ccdb30c42…

MALICIOUS

PDF

35.9 KB Created: 2021-07-04 08:37:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 35da7129315b1d5fd633626a37f9bc50 SHA-1: bd9ad884eeab279e16e8ba0be9c1e4e97c2ffd87 SHA-256: 03cad32ccdb30c422db4535fa97be800af02078db3b3ff08d6d62178f051c263
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. 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 5

  • 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.
  • 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/freespinandcoin-blogspot-com-game-hack PDF link annotation
    • http://library.stieyapan.ac.id//repository/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/earn-free-robux-roblox-game_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-2021-november-25-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-look-like-dio-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-roebucks_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
stream_002_off0000361e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x361E 22460 bytes
SHA-256: 4b9121ea93181d8646ae1e73f8b874bcfe43dd20e2e2e343204c5abcd700dce7
font_01_sfnt_off000067e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E1 18900 bytes
SHA-256: 21188b99be3b8f5d7031cb1e7beeffd6c85dae88b9ee67696710ab04d191542f

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