Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a85065efb7d1446…

MALICIOUS

PDF

37.5 KB Created: 2021-07-05 09:43:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 755dadffc2937c37065a25de3358f6c7 SHA-1: 848c15938953a26b45c067651be498220c00cfa9 SHA-256: 0a85065efb7d1446d1463bca17c20c33469f4d0e66a953f2c8b2c28d416f38c1
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/406889139/coin-master-mod-version-free-download-2021-game-hack PDF link annotation
    • https://library.elkatarie.ac.id/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coun-master_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/can-we-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-get-robux-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/basic-roblox-lua-programming-book-free_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/get-free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/hacks-for-roblox-backpacking-beta_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/robux-hack-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/eroblox-hq-free-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/urbis-roblox-money-cheat_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-get-free-robux-just-by-downloading-apps_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/robux-800-fre_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-get-hacks-on-roblox-counter-blox-roblox-offensive_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-2-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/hacker-web-robux_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
stream_002_off000037d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37D7 23576 bytes
SHA-256: 316d49acb5a4bf19a16ccdfb527b1613c1e4be1afb941dc60c44cc93d62bbf8a
font_01_sfnt_off00006d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D61 19112 bytes
SHA-256: 22bae62cee1156c32884908cd5ad0660b3f396efb11253eece0c2a5e2983ab52

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