Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffdaf6ae77f2abe…

MALICIOUS

PDF

46.6 KB Created: 2021-05-17 16:03:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cbeead6cba07f6b316f01e63fabdc3ba SHA-1: d6ea5c0cc55596d9d58667690c3a6368183180d0 SHA-256: 8ffdaf6ae77f2abe78768aeee47c22a713bb4c90cb8cc0a6c65117b13c7441a2
182 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. It uses a password-protected-archive 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 0.8948

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-to-get-free-robux-fast-and-easy-game-hack PDF link annotation
    • http://spentulib.com/search/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search//repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search//repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://spentulib.com/search/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search//repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://spentulib.com/search/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://spentulib.com/search//repository/how-to-get-free-robux-hack_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_003_off00004765.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4765 28788 bytes
SHA-256: 0085ba5445a989656811aa15e1383dcff7bbe8feb036d47fc3bf65e209478260
font_01_sfnt_off00008766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8766 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off00009191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9191 18864 bytes
SHA-256: 264ac3d9ee16189788a918c90b00fec891485e046f110455159a23ab28eb8c09

Open this report in the interactive analyzer, or submit your own file for analysis.