Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ffd4a14a38d56c…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 17:00:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 96ce1bcfcc40fafc723bdf3677b413a7 SHA-1: 208aa824e0407843ec331737b9298e91293562f7 SHA-256: c1ffd4a14a38d56c5418e768f1c091c3745926171c512e16cd0ccedc3018dfdf
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/431946152/how-to-cheat-in-roblox-games-defenders-of-roblox-game-hack PDF link annotation
    • https://perpus.upp.ac.id/digilib/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/i-finally-found-a-game-that-gives-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/pokemon-go-free-85_GM1094591345.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-guest-play-for-free_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/assian-free-knife-code-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/noclip-for-camera-hack-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-do-roblox-wall-hacks_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-email-rewards_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robux-redeem_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/join-this-roblox-group-for-free-robux-roblox-group_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/hack-block-piece-roblox-autofarm_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robux-best_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robux-generator-without-verification_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
font_00_sfnt_off00003135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3135 22888 bytes
SHA-256: b681179dedef73e9263455cf91f84e3c430075bced2079fb5464d6b4cc86c87f
font_01_sfnt_off00006432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6432 19520 bytes
SHA-256: e4b5691763920468442c805b90b959a6667961164026a40e534c0723ac11c997

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