Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf62b40437c863a9…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 11:47:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f318d744f6dbec02ebb4af90e3a3a911 SHA-1: 1aaa85fa791f5f86b3f6aaabe80ce3c15911ba43 SHA-256: bf62b40437c863a9304d4fcbb213d523d409235a4fa34f45f40ecc8413e0458b
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 0.9874

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/479516143/bad-minecraft-free-game-hack PDF link annotation
    • https://library.stikesmi.ac.id/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/pokemon-go-free-to-play-guide_GM1094591345.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • https://library.stikesmi.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn 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
font_00_sfnt_off00004e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E98 24932 bytes
SHA-256: 02d1379cb4bc72424c92e189b2c77147bc6917bdc1ed0956715922c9553e691e
font_01_sfnt_off00008676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8676 17956 bytes
SHA-256: 384105d45f3b455646b6eb64dcdb09349e5e1756e4baf8ede6c7c1462ef2dc47

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