Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f74001f9ec3b1c1…

MALICIOUS

PDF

42.7 KB Created: 2021-06-13 23:13:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ce39bab36dc6e6b7740f981583de61e6 SHA-1: b61c87dbd14301e511d956eb82bda6e33651cd84 SHA-256: 8f74001f9ec3b1c1af97d8068d1ce680564ebe5afd90b1b3983ae1c548b602e7
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 0.9971

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.
  • 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 http://netcdn.co/app/431946152/all-free-roblox-catalog-items-game-hack PDF link annotation
    • http://opac.fuf.uin-alauddin.ac.id/repository/roblox-game-download-hacks-studio-login-guide-unofficial_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-download-roblox-on-computer-hack_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-make-your-roblox-account-hackerproof_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-super-power-training-simulator-vip-servers-roblox_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-do-you-get-free-robux-instinly_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/roblox-games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/hack-phantom-forces-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/synapse-level-7-exploit-crack-download-free-roblox_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/get-unlimted-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/how-to-get-free-obc-on-roblox-no-hacks_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-roblox-promo-codes-december-2021_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-robux-promo-codes-november-2021_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/wikihow-how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://opac.fuf.uin-alauddin.ac.id/repository/free-download-of-roblox-for-pc_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_off00004926.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4926 25240 bytes
SHA-256: 63305a73cfa33ba7d8db4f7eb60453d6603167f57d4e4a8d395090876efc1e5f
font_01_sfnt_off0000830a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x830A 18828 bytes
SHA-256: af9b01869ad2a867af5d7c328d90521b907d62bc753ea6ec2d8e63d01a567195

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