Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7eae955e91de5f…

MALICIOUS

PDF

51.8 KB Created: 2021-06-11 05:23:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3cec7bc2627f7e41913c239509e6d38a SHA-1: 4f8ed5898913ac1ebb30ba1fa419c262324430b2 SHA-256: fd7eae955e91de5f83d1c7eed8469da533a0edcb725ec3c7134ee7292fa9ab8d
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9657

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-roblox-gift-card-codes-workind-in-2021-game-hack PDF link annotation
    • https://xiangquan.com.tw/image/data/files/free-group-roblox_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-make-shirt-price-free_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/roblox-free-dominus-promo-code-2021_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-daily-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • https://xiangquan.com.tw/image/data/files/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005242.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5242 25396 bytes
SHA-256: 37e14be379943acf2bca2c0b8ad56717f94aacf06bfbff67b1f287a11dc854d2
font_01_sfnt_off00008cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF0 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off000096fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96FB 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA40D 19344 bytes
SHA-256: f9ec3b08a3236f9527a6daac2778a87b9cf082c60eef8919cc5985b6e113ebd2

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