Malicious PDF — malware analysis report

Static analysis result for SHA-256 e676e053e18cc44c…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 14:42:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 791571903f5512aa416964dc5709a09f SHA-1: df3031753425651a4669f508827493ffa1b31fdc SHA-256: e676e053e18cc44c13bc0f6aadbcd4e71e8dc0042fefd50aa6b2dab4bb679d3d
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-free-robux-website-game-hack PDF link annotation
    • https://cogp.greentrade.org.tw/image/data/files/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/wie-kann-ich-robux-hacken-website-liste_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/bux-city-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-roblox-catolog-items-may-2021_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-texture-packs-for-minecraft-pe_GM479516143.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_off000030ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30FF 22024 bytes
SHA-256: 6c04194d3ac4b120eabff35a0288eb53e893488145353e32c1c59f547c396f50
font_01_sfnt_off0000616d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616D 19212 bytes
SHA-256: 4b1e8e9c88347b3f29ea09d9c43ed0e523ec5f5ba27152f0fbcfe198ff1f6a17

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