Malicious PDF — malware analysis report

Static analysis result for SHA-256 e906db11b13d7e38…

MALICIOUS

PDF

44.5 KB Created: 2021-05-16 02:34:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d42ffbfaca5c120df415bd7c4e8d4beb SHA-1: 64ee8166d64bcfdc3ca58632433ca213f03fb1aa SHA-256: e906db11b13d7e389cf360695a57f4a6df6d395080c4e4cac676694ef5d7a8b6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a common lure of 'free Robux' or game hacks to entice users into clicking embedded links. The links redirect to malicious websites, likely serving as a gateway for further exploitation or malware delivery. The PDF structure and numerous external links suggest a link farm or SEO poisoning tactic to drive traffic to these malicious sites.

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 https://netcdn.xyz/app/431946152/how-do-i-get-free-robux-on-roblox-game-hack PDF link annotation
    • https://tnupacktour.com.tw/image/data/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-pet-snacks-coin-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/wurst-112_GM479516143.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://tnupacktour.com.tw/image/data/files/minecraft-server-hacks_GM479516143.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_003_off00004bba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BBA 28096 bytes
SHA-256: aa7506accf2cbbfa292d39748e6a262df1156c57aa0682952f0365820d464d14
font_01_sfnt_off00008afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFC 18524 bytes
SHA-256: 4ccd670e6a0bad46446eeab730d71d218c542e1f5d690955267ad9a8693a3722

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