Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f01bd84daeb8b8e…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 05:25:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 147419e7a0e1cc9cc2ab68e81d7e99b9 SHA-1: 4d3e01260f36b1943d8bab9e563f97c6280ee97f SHA-256: 7f01bd84daeb8b8ef53095dfd32970943d95c91ab6fce4ec58f01007b3f15bf7
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. 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 0.9980

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.
  • 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.
  • 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 http://netcdn.tw/app/479516143/free-minecraft-skins-girl-game-hack PDF link annotation
    • http://alsworld.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/robux-hack-download-pc-2021_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/tiktok-free-to-watch-online_GM835599320.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-games-twitter-roblox_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/hack-money-vehicle-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/free-executor-roblox-no-key_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/how-to-get-robux-for-free-no-generator_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/dragon-ball-af-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://alsworld.com/uploaded_files/userfiles/files/roblox-steves-one-piece-hack-gui_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3144 22668 bytes
SHA-256: 4649d3506007fe639a31b32317578203f6bd387888961bf8c2b66ff9558c0cd3
font_01_sfnt_off000063e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E5 18100 bytes
SHA-256: b76f3dac7b7b3cf9eeb40e8d40f3dfeb641263e859efa56376b8d43c754683ba

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