Malicious PDF — malware analysis report

Static analysis result for SHA-256 324afc3fb5442b36…

MALICIOUS

PDF

49.2 KB Created: 2021-06-07 14:55:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3d85cfe46f585d98458a7f31eefb8a2d SHA-1: 89ec0ed8b11a9e5ee4917fc60e8ace26eb0f8c7a SHA-256: 324afc3fb5442b367b7c54492d2b46e2d316d38526566b6af41a20de97146e83
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 0.9796

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.tw/app/431946152/free-model-death-star-map-roblox-game-hack PDF link annotation
    • http://msfs-eastafrica.com/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/code-free-robux_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/hacked-client-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005083.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5083 30692 bytes
SHA-256: 78052a721774e67cf712a9c6578df03047efdf2abf7a8b9ccd0ffdd4f07f192e
font_01_sfnt_off00009176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9176 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B24 19160 bytes
SHA-256: bcfe41969e1a5e8c41e0e5dfc3ecfa38231d9f62526bdd5fe81148537971da3e

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