Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8eb31ef21da630…

MALICIOUS

PDF

42.4 KB Created: 2021-05-13 14:26:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d20b09c54d5c39c3725f1ca2b6fb4acc SHA-1: 11ce2aa611d6c0c27720344db99376affddfda49 SHA-256: de8eb31ef21da630e8af1a5d6be564020bcdf889582da80eb7f7197ea7a5796f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9971

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/coin-master-hack-no-verification-2021-game-hack PDF link annotation
    • https://imagetravelnepal.com/userfiles/files/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/chisel-and-bits-mod-pe_GM479516143.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/is-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/how-to-hack-roblox-accounts-on-phone-2021_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
stream_003_off00004b9a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B9A 24444 bytes
SHA-256: d2bb8fe8220a395de00d5166c619c0c0a3a7120bafdac06a78872209db2c08c3
font_01_sfnt_off00008345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8345 18252 bytes
SHA-256: 180d563c5e2d4e96f25bdfb7de4de3bd7d6a0696216fbddae55f211609535b0c

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