Malicious PDF — malware analysis report

Static analysis result for SHA-256 838a1e6638e09f67…

MALICIOUS

PDF

34.7 KB Created: 2021-07-01 20:59:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: afafb0066879c2ecfa415bb970c1b178 SHA-1: 15d371a08c696a3e5d9e9acc3426a86a52daefea SHA-256: 838a1e6638e09f6737a9e4b7035de0e6e9e9900fc70c7cebadd4b718a211a657
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.co/app/479516143/minecraft-java-for-free-game-hack PDF link annotation
    • https://www.advancissurgical.com/uploads/files/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-tix-roblox-no-survey_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-roblox-gift-cards-discord_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/wurst-18-9_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-robux-for-free-without-builders-club_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/irobux-fun-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-roblox-exploit-no-crash_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-dress-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-offer-earning-sites_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/best-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-your-hacked-account-back-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/maxim-games-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-admin-in-roblox_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_off000032f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32F5 22572 bytes
SHA-256: ece26e4319d4a4747c34c7cbc8aebf1c9d2cd59dd897e3d867f9d1a8d9ec7eb6
font_01_sfnt_off0000651c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651C 18276 bytes
SHA-256: 68849f4d63324190072240a7063db5b1f9739ca1319a3b9e65ce22385324d153

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