Malicious PDF — malware analysis report

Static analysis result for SHA-256 509abfb33eedb45d…

MALICIOUS

PDF

35.2 KB Created: 2021-07-09 10:40:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 07729158c6829fc81a0dd127bb58c1d6 SHA-1: 7e2ffb0ae198972f108c6b145c0139e279f4ac9b SHA-256: 509abfb33eedb45d3c9da0554f05861e78cf146dfb5e48da73ad6b7e0e5e8b19
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/431946152/roblox-hacking-software-free-download-game-hack PDF link annotation
    • https://klp.com.tr/inc/uploads/userfiles/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/free-robux-wheel_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/easy-no-servay-free-robux_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/easy-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/roblox-accounts-for-robux-for-free_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/free-robux-no-verify-no-download_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/roblox-account-hacked-and-pin-set_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/roblox-tiny-tanks-hack-for-rocket_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/roblox-free-bots_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/how-to-cheat-roblox-jailbreak-glitches_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/jump-hack-roblox-cheat-engine_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_off0000301d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x301D 22856 bytes
SHA-256: 3466aad7a6079a166874aa2374cfe128abd5fffe3d4f4dec813a8f2094396191
font_01_sfnt_off00006304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6304 19552 bytes
SHA-256: a65bf3468aa42f1c4e445140850bcd9e40d2d84c1d191b35d4bcde7c88ce7624

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