Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e646834bc35603…

MALICIOUS

PDF

42.6 KB Created: 2021-05-15 16:21:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cd7637a3eb670e3941e59947b9130dc0 SHA-1: b3d177553f362c50a1562ea0b7c69b3970f82af7 SHA-256: 31e646834bc35603bc56e681714c0ab72ab78e71abbade367679ae8e13596d29
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm or spam campaign. The presence of a visual download button and a direct link to a file on 'netcdn.xyz' suggests an attempt to trick users into downloading potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/479516143/wurst-game-hack
    • http://pizzeria-rosso.pl/images/coin-master-free-spins-2021-app_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/hack-free-spin-coin-master_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/gold-cards-coin-master-hack_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/minecraft-free-school_GM479516143.pdf
    • http://pizzeria-rosso.pl/images/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/coin-master-free-spins-app-android_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/free-robux-giveaway-live_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/roblox-promo-codes-free-robux_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/coin-master-hack-online-generator-without-human-verification_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/free-robux-sites-2021_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/coin-master-hack-mod-apk-android-1_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/coinmaster-spin-ml_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/free-shirt-templates-roblox_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/coin-master-links-free-spins_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/coin-master-hack-online-download_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/coin-master-free-spins-coins_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/free-minecraft-severs_GM479516143.pdf
    • http://pizzeria-rosso.pl/images/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • http://pizzeria-rosso.pl/images/coin-master-free-spins-hack-2021_GM406889139.pdf
    • http://pizzeria-rosso.pl/images/coin-master-hack-app-2021_GM406889139.pdf
    • https://youtu
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048ec.bin
f7041871af27947a0f9aa6cf5a2bd8757c468b355b2a8e5d06587d49dfee1523
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48EC 27036 bytes
font_01_sfnt_off00008673.bin
c7eba0d35d3482de39ce9cd640884e3a275f5f00d67f8fb5d6d0debc1aa3211b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8673 17556 bytes