Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfef95a3697ba55…

MALICIOUS

PDF

45.2 KB Created: 2021-05-11 05:02:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2a0a2ebb67db01701c1fbeb3d7a27c4e SHA-1: 1823fa679a3a9415d4734d2599de16e2de01bb9d SHA-256: 2dfef95a3697ba559d58a09fd56474040492b429331657a6dc5cbd7897876026
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 0.9621

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 https://netcdn.xyz/app/406889139/game-hack-coin-master-game-hack PDF link annotation
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/free-robux-stream_GM431946152.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/moon-active-games_GM406889139.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/kachifpro_GM406889139.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • https://www.blessflowers.com.au/uploaded_files/userfiles/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C34 25236 bytes
SHA-256: 6e13acfc5228aa570cf1ccb839ca6013cdc564d74b3ece9e2efc4db038782094
font_01_sfnt_off00008560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8560 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F11 17976 bytes
SHA-256: 6c4bc6518c449e74acc10e239ebc2a40e5371f7bb57007301009253b23203593

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