Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8e35e5d0383daf…

MALICIOUS

PDF

45.1 KB Created: 2021-05-13 18:19:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9442b40544dc38012f15811b72a4778a SHA-1: 2382de64763d1e1684a5fc3ae1d03484de739c48 SHA-256: 6d8e35e5d0383daf6d784dccb71d56cf767bf0a3e783201fe694b5f2d257b1fc
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 0.9632

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 https://netcdn.xyz/app/479516143/minecraft-xbox-360-free-download-code-game-hack PDF link annotation
    • http://kingmusic.pl/images/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/free-robux-images_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://kingmusic.pl/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • http://kingmusic.pl/images/free-avatar-roblox_GM431946152.pdfIn PDF document text
    • http://kingmusic.pl/images/how-to-gift-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004998.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4998 24416 bytes
SHA-256: 4d7c4ff1c4e458c7645e3b4df03230c776fd364a3e1ff9870c1c5b190a9512d1
font_01_sfnt_off00008062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8062 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00008a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A02 19400 bytes
SHA-256: 30b784ba3b356ec0b4997106bff5d55ef8f2e70b19d5a22bd2903de8139c4554

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