Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c50acaa9df37cba…

MALICIOUS

PDF

50.3 KB Created: 2021-06-07 16:12:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3f5f21cf2e04421996f497113fab37f2 SHA-1: 2910038437a4087366a065bb4726f01d7b365106 SHA-256: 2c50acaa9df37cba265ce091fc88db1481663d35de131b9a7c38a18497a63ca7
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 0.9769

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.tw/app/431946152/what-do-you-do-when-your-roblox-account-is-hacked-game-hack PDF link annotation
    • http://mycookingpot.com/images/tiktok-likes-free_GM835599320.pdfIn PDF document text
    • http://mycookingpot.com/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://mycookingpot.com/images/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://mycookingpot.com/images/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • http://mycookingpot.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/gift-card-roblox-free_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/claim-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000536b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x536B 27564 bytes
SHA-256: 4028f057175f4a94de71103692eedbdd78d1c59acf48830dd065954b0fb26de8
font_01_sfnt_off0000922e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x922E 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED5 19292 bytes
SHA-256: 5f5595ab3b10c96abfa1867387468e1501f28f4850a37eea6a60df2ee8f2c814

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