Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf10cb4ad50672dc…

MALICIOUS

PDF

47.1 KB Created: 2021-06-08 12:39:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bdf87d665ba9dd74a42dae0324eb7972 SHA-1: 1e39722bcc4e11e86f81345b0a86b95dc2341f23 SHA-256: cf10cb4ad50672dc5979bb310afe92112be50035bb87647d43c137dc180744a5
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which are structured as a link farm pointing to other PDF documents. The document body, though partially corrupted, suggests a lure related to game cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of a link farm and external URIs supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/roblox-paintball-cheat-codes-game-hack
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-spins-and-coins-coin-master-app_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/games-to-get-free-robux_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-hacks-for-cards_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-spins-coin-master-october-17-2021_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-free-gold-cards-link-2021_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-free-link-facebook_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coinmasterhack-club_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-mod-version-free-download-v344_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/hack-coin-master-apk-2021_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-cheat-codes_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-robux-gift-card-codes_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-hack-pc-download_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/tiktok-likes-free_GM835599320.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-free_GM406889139.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/minecraft-realms-free_GM479516143.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-robux-working_GM431946152.pdf
    • http://wwlogistic.net/uploaded_files/userfiles/files/easypoints-gg-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005417.bin
28a5ac27d331ee66e76f744aa0a4195aedd779aa4bf99d29951dd67f12485fe9
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5417 27628 bytes
font_01_sfnt_off00009435.bin
f4c149a6ea7973d18108f23f1aeddfcd56a290e2b7da20f298731b92ba10fee6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9435 18732 bytes