Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa73ec4476ea42a5…

MALICIOUS

PDF

33.2 KB Created: 2021-07-06 17:13:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 041d65c4a8fb0624e1891ef22bb6b62f SHA-1: 92a645142241925a3d7b33caf1255e00e0715ec7 SHA-256: fa73ec4476ea42a5b4397ba518d5046260a371bf3cf4f27056027151ddd18188
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/how-to-get-a-free-minecraft-server-game-hack PDF link annotation
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-stuff-in-roblox-on-ipad_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hack-para-murder-mistery-2-2021-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-westover-hacks_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/dooms-pike-brickbattle-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/do-free-robux-websites-work_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/gain-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/camisetas-de-roblox-de-hacker_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-items-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/bug-free-uniform-of-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-clothe-goku-free-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-cheats-for-robux-pc_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-robot-inc-cheat_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/menu-hacks-kupkake-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-faces-on-roblox-names_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-gsg9-roblox-group_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/can-people-hack-your-computer-through-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-free-gamepasses_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/give-me-robux-for-free-now_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_off00002f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F40 21800 bytes
SHA-256: 36d0971c743d643b916c8efaf127ca71af440e802404d87b59dfdac70e71f143
font_01_sfnt_off00005f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F15 18276 bytes
SHA-256: c7687a4ed826b999755e6fe3d140333e3438c4cba827dc1a6d1eeb6d89324bde

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