Malicious PDF — malware analysis report

Static analysis result for SHA-256 684a25d4d1de3eba…

MALICIOUS

PDF

34.2 KB Created: 2021-06-20 22:48:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d24891decf92c28c96e566e81ce84831 SHA-1: 217db45b8ea55b540d9ce9ac89775ace4b10cbd1 SHA-256: 684a25d4d1de3eba9747f641adb33b14b6ee0dca76be203a6df026836c73a59b
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.co/app/431946152/cheat-engine-cheat-tables-roblox-game-hack PDF link annotation
    • http://torkelson.se/images/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/no-human-verification_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/roblox-hack-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/how-to-hack-key-login-roblox-exploit_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/free-exploits-website-downloads-roblox-2021_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-redeem-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/robux-free-for-android_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/free-100-robuxs_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-script-exploit-to-use-in-roblox_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/clothes-that-are-free-on-roblox_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_off00002ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED7 22636 bytes
SHA-256: f55f452145ea4362d2f0dffb4b4368d94fed396f62997a760590ff9bdbec0ab5
font_01_sfnt_off00006142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6142 18876 bytes
SHA-256: 026f5e4e0b8e950de73960d4631737c70b3961cc0db06455a88fe5a5f74658ca

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