Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db345bd4dc4bfd2…

MALICIOUS

PDF

35.7 KB Created: 2021-07-03 16:24:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5e1848bd8b05e2963786e196da31247f SHA-1: ff8efa70ebae9c1df6f73c0d42ec62061d3b8889 SHA-256: 8db345bd4dc4bfd2c439479c1a21877e57ba767d296b86f7ef2ba4509bfe0405
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-mod-apk-latest-hack-with-unlimited-free-spins-game-hack PDF link annotation
    • http://digilib.ulm.ac.id/pusat/repository/how-to-make-clothes-without-hacks-or-bc-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-pastebin-console_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-generator-that-actually-works_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hacks-for-roblox-weight-lifting-simulator-3_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/como-distinguir-a-un-hackear-de-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/drive-through-restaurant-tycoon-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-so-sick-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-bedrock-edition-free-with-java_GM479516143.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
stream_002_off00003192.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3192 23096 bytes
SHA-256: d68d07f44d7ea6eeb1e1fcfae606eae64f1ad5e6456140109aac4c69d42a792d
font_01_sfnt_off000065b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B8 19400 bytes
SHA-256: f0d5d55ca8cd0a4869404731018205be1ec0a41f36e7030a242679dc5fdaa466

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