Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aae274a91b5026c…

MALICIOUS

PDF

40.8 KB Created: 2021-05-19 09:44:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7715ccc0b62b11f61c85598b54bdecb7 SHA-1: 11eca6e5bc4844c424f6d0802b490214ae9324b0 SHA-256: 6aae274a91b5026c9bef016876be78d6cdcc73f8e77befc25afa4a02e344802c
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 0.9971

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.xyz/app/1330123889/pubg-uc-sale-game-hack PDF link annotation
    • https://dentmate.com.tw/image/data/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-do-you-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-blogspot_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-free-spins-2021-app_GM406889139.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_off00004639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4639 25388 bytes
SHA-256: 93a266375c0e9b0601ce26c45fd751522f8c9139b688dc8bf47d536c568863cb
font_01_sfnt_off00007d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D46 18200 bytes
SHA-256: fe3c0b957c3a878cbf5467c5093089b5b458fb8b2624b74a356101e91c8145b9

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