Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83c2282245c8b79…

MALICIOUS

PDF

44.4 KB Created: 2021-05-12 04:16:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8d274ff11bb961fe311d717142a79737 SHA-1: 8e95c1046dd4fa61bcda75c4d8a1733572e26198 SHA-256: a83c2282245c8b7959282674f2534e9750a2583b85802198dd0f0992e7a3ef78
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 0.9632

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-link-today-2021-game-hack PDF link annotation
    • https://financia-business-school.com/static/upload/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-coin-master-coins-and-spins_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49E7 23896 bytes
SHA-256: ebb58ab6bf3ed225420af3b375e0b97016dec1ab49f66ea32d85d7273d81e775
font_01_sfnt_off00007f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7D 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000892f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x892F 18812 bytes
SHA-256: 209d45ed87732d827821998a5283e56b95c39a3af4032faff2e6da7d3e76f78f

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