Malicious PDF — malware analysis report

Static analysis result for SHA-256 5933d513bdd3d129…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 09:40:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b0d021a6a71aa8a913e0a7fd50069781 SHA-1: fc35dafe9b39de8158fb66fbd474c588736be5d8 SHA-256: 5933d513bdd3d12936b463115e921ff956ea1586216b81a5e345bf35340a11d4
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/406889139/coinmaster-spin-ml-free-game-hack PDF link annotation
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/get-gold-coin-master-village-hack_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/granny-roblox-free-money-pro-hacks_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/tiktok-free-10-followers_GM835599320.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-commands-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/2021-fe-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/robux-hack-inspect-element_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-earn-free-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-tycoon-games-hacked_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/try-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/growtrooperz-free-robux_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-account-hacked-no-email-address_GM431946152.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.rigor.co.mz/uploaded_files/userfiles/files/how-to-have-clothe-free-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3206 22740 bytes
SHA-256: b358a8d515fb264c5bc97def6e272a0f607d8106caeb5dad3e8188bec9ec24a8
font_01_sfnt_off00006525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6525 18508 bytes
SHA-256: 5a873bb0356ec19a5dc0adacee915e4f1795f488777b3765821418f1979d1dc0

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