Malicious PDF — malware analysis report

Static analysis result for SHA-256 103f39117244cf9f…

MALICIOUS

PDF

35.6 KB Created: 2021-07-08 00:34:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e7d96de278ca51ddd7b47cf853d730a0 SHA-1: a23d8ad8cfeb2a6f2afcf2e6abc905e99fd24546 SHA-256: 103f39117244cf9f02d0c86c2967f06946a457aa69c80f300d139cdc83fbf17a
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-daily-free-spins-link-2021-game-hack PDF link annotation
    • http://digilib-unirow.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/hack-de-robux-2021-android-fast_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/gues-that-song-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-hack-for-android_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/withdraw-robux_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000333a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x333A 22528 bytes
SHA-256: ea2d5e4fcd8d60972a440d8a65550c7ce5cba2d42e6e056550da7e08275b792b
font_01_sfnt_off00006598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6598 19168 bytes
SHA-256: 84c37497ea3199e4eb4935d9e68ab24163eb72568577da040a17a4be5b808e19

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