Malicious PDF — malware analysis report

Static analysis result for SHA-256 f710de7a5d675009…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 12:14:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 02838e2c8a837ee4eba34be1f39f4766 SHA-1: e40beedd4d9102a862515e2f8d7edd87cc623352 SHA-256: f710de7a5d675009d38600919cce49a597e116301b2e54d166c7983b14893762
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 0.9865

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.online/app/406889139/www-cheatsk-com-coin-master-hack-game-hack PDF link annotation
    • https://www.insol-europe.org/uploads/files/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-hack-online-android_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-spin-coin_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-hack-progamers_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/mc-update_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/tiktok-free-followers-apk_GM835599320.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_004_off00004dc3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DC3 26996 bytes
SHA-256: dd6d37839c0e5a0b1f24992a0e589ddcac663ed01e9a5cdfca4cd17a32f7dbea
font_01_sfnt_off00008af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF9 18504 bytes
SHA-256: 34cd0f80a144e99ec60e90584a0fe8d035c842e631b0412131c0520909d0576d

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