Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a172647f0bbcdd…

MALICIOUS

PDF

35.8 KB Created: 2021-07-01 17:01:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9ac902d608d8b32e19f1cb9a86750c4f SHA-1: e6094166ea9b50b41ec3f37e10b4aaca7e863a04 SHA-256: 31a172647f0bbcddacb68926c762b95783caa4c755fe941cc28c458e44b7d1ea
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links disguised as generators or hacks for the game Roblox, aiming to trick users into clicking them. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, and the 'PDF_GAME_HACK_REDIRECT_LURE' confirms the deceptive nature of these links. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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/431946152/roblox-milenari-headphones-free-game-hack PDF link annotation
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/hacked-roblox-format_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-robux-password-needed_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/como-ser-un-hacker-en-roblox-impact-y-sin-virus_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-faces-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/get-infinite-money-roblox-online-money-hack-script_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/cool-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/roblox-name-that-famous-character-cheats_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-robux-in-roblox-2021-nick-therobloxiantv_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-dominus-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/hacker-website-prank-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-robux-dylan-grant_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/hack-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/best-roblox-scripts-to-hack-games-feree_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://digilib.stkip-pgri-sumbar.ac.id/repository/coin-master-free-spin-today-2021_GM406889139.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_off000034e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34E9 22176 bytes
SHA-256: 44484a49d341f43fc142928b0d874b38d224a0453ef38f7a604e9aba7ea725e8
font_01_sfnt_off000065ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65EE 19480 bytes
SHA-256: 39cd9a2e147a7ff00562d63612955637054b8fca0471d116ab516b3b77f17ceb

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