Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7eaf27420d802a…

MALICIOUS

PDF

45.3 KB Created: 2021-05-16 08:30:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 58e8577d8d7e14f43ed4b6f1886aac24 SHA-1: 605b0f0752c958fa0f6cd5440517c7273df67daa SHA-256: 4c7eaf27420d802ac7131cb4803ab54b9e95b25bdba8fcd30ce64aeeab5ef2a6
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 0.9507

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.xyz/app/406889139/free-coins-and-spins-for-coin-master-game-hack PDF link annotation
    • http://mebliok.com.ua/images/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://mebliok.com.ua/images/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/free-robux-download_GM431946152.pdfIn PDF document text
    • http://mebliok.com.ua/images/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • http://mebliok.com.ua/images/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://mebliok.com.ua/images/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://mebliok.com.ua/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://mebliok.com.ua/images/free-robux-website_GM431946152.pdfIn PDF document text
    • http://mebliok.com.ua/images/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://mebliok.com.ua/images/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://mebliok.com.ua/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://mebliok.com.ua/images/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ba8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BA8 25004 bytes
SHA-256: 88cc2f0554071387893f71210e16c8114508a929e581dcd1655b42e0b94f817f
font_01_sfnt_off00008572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8572 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5C 18060 bytes
SHA-256: f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120

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