Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c974699ed55382…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 14:48:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: eb42086072283882f6c396a64825d5c6 SHA-1: 6e6ec7d7d458a259c8356f6f2097df4bd39a6758 SHA-256: 92c974699ed55382433c2f285ae20bafead84de877aedd84eb73d186ce843e59
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/479516143/wurst-112-2-game-hack PDF link annotation
    • http://www.stttekstil.ac.id/elib/repository/conquerors-3-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/pokemon-go-free-codes-2021_GM1094591345.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-dragon-ball-rage-cheats_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/cuentas-gratis-de-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-robux-on-phone-no-download_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/october-2021-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/nonsence-dimond-roblox-pet-simulator-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/robux-codes-2021-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-dragon-ball-rage-stats-hack-phezii-br_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-assassin-free-knives_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-roblox-hats-promo-code-wiki_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-codes-not-used-2021-july_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_off000033f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33F0 22868 bytes
SHA-256: 8d387c1c73e46192452063c9e25360b065c023852fb5b0de0e329a296b790a3b
font_01_sfnt_off0000671d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671D 18304 bytes
SHA-256: 68e2a8980d4d1d96479e0928bc49a2bdfde0755f91194607075bba0998720a46

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