Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f814e7c4787c1b4…

MALICIOUS

PDF

46.3 KB Created: 2021-06-13 21:26:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a7f66ddb2763f85a02a9c05727482bdd SHA-1: c306e399c742f94ef26301cc2588a2fe4b548f24 SHA-256: 6f814e7c4787c1b40dc9116b8f39e819775c0e86382f9608ea7e2ae95f360f30
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document employs a lure related to game cheats and hacks to entice users. It contains numerous external links, identified as a link farm, that redirect to other PDF files. This suggests a tactic to manipulate search engine results or distribute further malicious content through a chain of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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.co/app/431946152/jailbreak-cheats-for-roblox-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/wwwcoin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/como-hackear-roblox-2021-espaol_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-shotgun-lua-hack-command_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-royale-high-cheats-for-diamonds-2021-on-xbox-one_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-an-invisable-head-in-roblox-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-pokemon-go-cheats_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-pagina-oficial_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-hack-in-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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000491b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491B 25112 bytes
SHA-256: 17c62543b43f64a32a5d62bd8c042a0fb4cf411013178c8a791bb6b84f92936b
font_01_sfnt_off00008358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8358 4008 bytes
SHA-256: 515da38a799acdefd039af3a0dfb6ec4815b572058c9bd492ec5a77cd7658593
font_02_sfnt_off000090e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90E3 18900 bytes
SHA-256: 45031a22b79dfeecee2ba21875ba553a571a9dd9fb94b749b20523fb0653356f

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