Malicious PDF — malware analysis report

Static analysis result for SHA-256 835cfed7cb4d63f2…

MALICIOUS

PDF

35.7 KB Created: 2021-07-04 04:58:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9869922e4f4f52e7288c6fdfcc0dd47e SHA-1: ddb3b0f4c5011854062b283493be69353923d854 SHA-256: 835cfed7cb4d63f29db34a95133e5aa4b724035c0f4ad6d9aa07122b1c18a1cb
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/406889139/game-coin-master-hack-game-hack PDF link annotation
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-hacks-for-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-deal-with-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/como-hackear-roblox-para-tener-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/code-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/tampermonkey-robux-hack-that-works_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-robux-obby-link-in-august-2021_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/get-unlimited-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-get-robux-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/minecraft-apk-114-4_GM479516143.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-iphone_GM406889139.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
stream_002_off00003669.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3669 22648 bytes
SHA-256: 6d2852f18c61ae4458fc0be59d14b15f98648f12da4ecb635ec9e9df63f136ac
font_01_sfnt_off000068d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D4 18264 bytes
SHA-256: 4883b68d917223b36ebda143fb66fbc926b5e637eedc4d31d59cc59de5fda36b

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