Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc78df6de8827194…

MALICIOUS

PDF

34.1 KB Created: 2021-07-08 20:09:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 93e13c4df8f85c01955bad5605e9511d SHA-1: 376db873818492cb5252cfd29d4b8a9e94f9f8d2 SHA-256: bc78df6de8827194a38a4efe4f06fea69839f1b07bcdae978e6b017e7453ef49
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/coin-master-free-spins-daily-game-hack PDF link annotation
    • http://stitqi.ac.id/website/repository/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/hes-hacking-roblox-phantom-forces_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/free-spins_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-to-o-get-free-coin-master-spins_GM406889139.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_off00002f44.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F44 22480 bytes
SHA-256: 57f4c18fc9c450f95ae0b4600cf5d44ec6f92f50f1e4503417210fc41babb7db
font_01_sfnt_off000061a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A0 18596 bytes
SHA-256: 9b8358e598e07f7d28a63a566b047adfcbccaa59c97f3816d59e3cdcc62e8d14

Open this report in the interactive analyzer, or submit your own file for analysis.