Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78f3e1b2822ce9a…

MALICIOUS

PDF

34.8 KB Created: 2021-07-08 15:31:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 12157cf8c554444ce93005b66e2796da SHA-1: 846fea2449a4114494c348a320b74a913c901211 SHA-256: e78f3e1b2822ce9a5ec19578c50a4dfa45b582368d052b18cf8b3772c4b2f98d
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.tw/app/431946152/roblox-rape-game-hack PDF link annotation
    • https://mobile.connecttravel.com.tw/image/data/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/adopt-me-hack-roblox_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/all-might-roblox-free-shop-t-schirt_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-free-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/best-bow-free-models-roblox_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/best-exploit-roblox-free_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/hacks-master-keys-dungeon-shooter-roblox_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-hack-coin-master-game_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-hack-roblox-accounts-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_off000032d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32D4 22208 bytes
SHA-256: 7fe97aa01fa74f907f9b4531c37adf8d777f20804721ee53f1740f50af875bdb
font_01_sfnt_off00006411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6411 18664 bytes
SHA-256: fe14123ce2711b2ffd0ba583e6768d40fb29997b781900255e18c814d8d61246

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