Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98d2686d8d65d7f…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 12:11:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 71f1bf667486236919be6cd6bb9964fa SHA-1: 129c8e24c6d051fdaf0bd3adbf7caf6a94644cc6 SHA-256: a98d2686d8d65d7f00331ab49cfde51a8f85f015e3fd5a83aca7f3a85df6a6ae
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/minecraft-beta-free-game-hack PDF link annotation
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/hacks-for-roblox-apocalypse-rising_GM431946152.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/roblox-how-to-get-bloxburg-for-free_GM431946152.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/how-to-hack-people-easy-on-roblox-web-site_GM431946152.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/roblox-cheating-dll_GM431946152.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/como-hackear-roblox-con-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/free-robux-generator-only-username_GM431946152.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/free-roblox-stuff-links_GM431946152.pdfIn PDF document text
    • https://www.jogjamanisfoods.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-app-download_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_off000031ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31EE 22256 bytes
SHA-256: 577ebdc949140d73f96d8410c8c99489d7254a03c903c7feb7de90ad5ac2eaf5
font_01_sfnt_off00006338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6338 18072 bytes
SHA-256: 93eaf246314330a04d19d7a2ad76ecc13e18bc21eade9aedb21d3f8ca46bad9f

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