Malicious PDF — malware analysis report

Static analysis result for SHA-256 25492aba2a4f18a8…

MALICIOUS

PDF

46.7 KB Created: 2021-05-13 03:11:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3f785578bfbcc8766b3bc210a848b187 SHA-1: bc2c17f63b2b00531b7afc7a3546006fea14eb79 SHA-256: 25492aba2a4f18a8495a7a98cd7fe8ee8af915de13608f6148055827eb9e5daf
142 Risk Score

Malware Insights

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

This PDF document exhibits malicious behavior by acting as a lure for potentially harmful downloads, disguised as game hacks or free items. It contains a significant number of external links, many of which are structured to appear as SEO-optimized content, and employs a payment redirection lure. The ML classifier strongly indicated maliciousness, and the presence of embedded URIs suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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/431946152/instantrobux-game-hack
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-free-pin_GM406889139.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-minecraft-packs_GM479516143.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-free-spins-glitch_GM406889139.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-free-spins-iphone-2021_GM406889139.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/is-minecraft-free-on-ps4_GM479516143.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-get-free-coins-for-coin-master_GM406889139.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/is-minecraft-education-edition-free_GM479516143.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-free-spins-without-verification_GM406889139.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/password-free-roblox-accounts_GM431946152.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/robux-free-c_GM431946152.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/minecraft-online-free-download_GM479516143.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/coin-master-free-cards-hack_GM406889139.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/free-robux-giveaway-live_GM431946152.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/minecraft-hacks-wurst_GM479516143.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/robux-generator-no-survey_GM431946152.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004e72.bin
4c49469b0b9e0771d844788480e07bec0fb695ec98fb58db046d79d2dfb13a73		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E72 31536 bytes
font_01_sfnt_off000094d0.bin
4d77632c85c001e266779ad9698d54220e11b78bd17d8b0f085f3dc4dd17180b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94D0 18184 bytes

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