Malicious PDF — malware analysis report

Static analysis result for SHA-256 388785b1fd006a1a…

MALICIOUS

PDF

53.1 KB Created: 2021-06-09 04:55:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0d04017f42cb71d1f1319383139f2f88 SHA-1: d4c338175d55cda45cec152c7953688feb3a9bf6 SHA-256: 388785b1fd006a1adeda4b225a53cdf6163c500c0a6474ca011bdf27f48c69ad
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized and point to websites offering free items or currency for games like Roblox and Coin Master. The ML classifier also flagged this PDF as malicious. The presence of embedded links suggests an attempt to direct users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9607

Heuristics 4

  • 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.
  • 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/all-might-roblox-free-shop-t-schirts-game-hack
    • https://www.gvandenakker.nl/images/free-spin-link-of-coin-master_GM406889139.pdf
    • https://www.gvandenakker.nl/images/roblox-free-items-glitch-2021_GM431946152.pdf
    • https://www.gvandenakker.nl/images/free-item-going-limited-in-roblox_GM431946152.pdf
    • https://www.gvandenakker.nl/images/free-robux-on-iphone_GM431946152.pdf
    • https://www.gvandenakker.nl/images/robux-com-free_GM431946152.pdf
    • https://www.gvandenakker.nl/images/free-robux-2021_GM431946152.pdf
    • https://www.gvandenakker.nl/images/coin-master-free-link-spin_GM406889139.pdf
    • https://www.gvandenakker.nl/images/minecraft-free-apk_GM479516143.pdf
    • https://www.gvandenakker.nl/images/download-coin-master-hack-apk_GM406889139.pdf
    • https://www.gvandenakker.nl/images/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://www.gvandenakker.nl/images/free-robux-for-kids-no-verification_GM431946152.pdf
    • https://www.gvandenakker.nl/images/free-coins-for-coin-master_GM406889139.pdf
    • https://www.gvandenakker.nl/images/is-roblox-free-on-ps4_GM431946152.pdf
    • https://www.gvandenakker.nl/images/coin-master-hack-2021-no-survey_GM406889139.pdf
    • https://www.gvandenakker.nl/images/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • https://www.gvandenakker.nl/images/free-roblox-cards-pin-number_GM431946152.pdf
    • https://www.gvandenakker.nl/images/coin-master-hack-apk-iphone_GM406889139.pdf
    • https://www.gvandenakker.nl/images/coin-master-free-spins-promo-code_GM406889139.pdf
    • https://www.gvandenakker.nl/images/free-ways-to-get-robux_GM431946152.pdf
    • https://www.gvandenakker.nl/images/how-to-get-free-robux-ipad-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000521c.bin
55837380e18c2a6852266ff82a9f1ad7a4b5a7c0d0b05ade21537719d2e747d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x521C 26548 bytes
font_01_sfnt_off00008ee1.bin
0f10adbf105d053971010bc1f17c4dd55814d599674c84f75a6eb4cb46a9c89b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE1 2896 bytes
font_02_sfnt_off000098d3.bin
a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
pdf-font-stream PDF embedded font (sfnt) at offset 0x98D3 7448 bytes
font_03_sfnt_off0000aab6.bin
c52232faf2e0b5e95037e7ba0933c0a717827da6fd1b1346a3613e6e64dccd4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB6 18996 bytes