Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b59258fae8745da…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 14:15:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cdf885a673aa0027a9f73b9fcda9a15a SHA-1: 2159726c1714ab34e3514507c6dee2b8a200d7fc SHA-256: 9b59258fae8745da0a43241260a7cc5bb7899cedc92f5f002e3e1255a814d736
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/links-to-get-free-spins-on-coin-master-game-hack PDF link annotation
    • http://aleshashop.net/uploaded_files/userfiles/files/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/how-to-trade-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/free-robux-real-no-hack_GM431946152.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/free-cool-lit-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/free-robux-websites-that-work-2021_GM431946152.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/how-to-get-free-money-in-adopt-me-roblox-2021_GM431946152.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/get-me-robux_GM431946152.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/roblox-free-builders-club-generator_GM431946152.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/pokemon-go-free-download-for-windows-10_GM1094591345.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/simon-says-hacks-roblox-2021_GM431946152.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/roblox-promo-code-hack-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/coin-master-free-spins-apple_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_off00003266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3266 22292 bytes
SHA-256: 1a6a9cccc9507077e4443e98ba5484bbc8f1331d9b24ad7e7c2bbb1cce802630
font_01_sfnt_off000063ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63ED 18344 bytes
SHA-256: 1dde3a634a35d4e9c8cc8702715575f7350bc413b734fd9f7bac35511dc11ac3

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