Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ccd4ce5abe34f12…

MALICIOUS

PDF

45.4 KB Created: 2021-06-08 17:32:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b6e4dab937d1f7ee2db2734cf7daca8d SHA-1: 3a30d07a184fd4ae08a0741b54c2353dd2cbcb37 SHA-256: 2ccd4ce5abe34f1281d5c5e8fc5305d307e24d05f04236f49bb544ae000a1b5c
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 0.9864

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.tw/app/431946152/roblox-fishing-simulator-hack-game-hack PDF link annotation
    • https://xiangquan.com.tw/image/data/files/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/tiktok-free-view-40_GM835599320.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-hack-iphone_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-become-a-hacker-in-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
stream_004_off00005127.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5127 25536 bytes
SHA-256: 6bb400a56c045bfdc9f57d1065c616a98576d66b6616210cfc290477afc75848
font_01_sfnt_off00008bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCA 19424 bytes
SHA-256: d9cfc5056d27af647c33da3b92d1f63e60375f64abc8546d39adbdb4d45635df

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