Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd9560253e5cc89…

MALICIOUS

PDF

45.5 KB Created: 2021-06-07 01:18:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1b1d072a61ccce95fc8e60263b0c8518 SHA-1: d3e07d25a8995d664348dce8e4c943a04278934b SHA-256: dcd9560253e5cc891bd251a5f60e22ee84396baed47b8b573c068967a20620bb
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 0.9864

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 https://netcdn.tw/app/431946152/free-clear-shirt-roblox-game-hack PDF link annotation
    • https://www.stkdb.cz/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.stkdb.cz/images/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.stkdb.cz/images/robux-codes_GM431946152.pdfIn PDF document text
    • https://www.stkdb.cz/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.stkdb.cz/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.stkdb.cz/images/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • https://www.stkdb.cz/images/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.stkdb.cz/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.stkdb.cz/images/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • https://www.stkdb.cz/images/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • https://www.stkdb.cz/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • https://www.stkdb.cz/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.stkdb.cz/images/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.stkdb.cz/images/pokemon-go-free-100-iv-map_GM1094591345.pdfIn PDF document text
    • https://www.stkdb.cz/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://www.stkdb.cz/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://www.stkdb.cz/images/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • https://www.stkdb.cz/images/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • https://www.stkdb.cz/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.stkdb.cz/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://discordIn 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_004_off00004f4e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F4E 27736 bytes
SHA-256: 5ad2d2648613a37d672e8cc3d0ae22e5d68b926bdb86701cef707bc3156c4e10
font_01_sfnt_off00008e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E62 18564 bytes
SHA-256: 23259e9780677d578beca875b1259b249627a364d5a3b34ba4d7abbc0bdadfa6

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