Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e15ca9075ba967…

MALICIOUS

PDF

35.4 KB Created: 2021-07-04 06:55:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3f96b5a97f04ffd4ea6c6154e4129e28 SHA-1: 38ce20f6a769bb1cbbb10752fac3ab41e9d5922a SHA-256: c4e15ca9075ba96776f53109bf35d5c8870f0a7b5db86d734acde04abd70fb42
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/coin-master-spin-link-hack-game-hack PDF link annotation
    • http://www.valenciamaids.com/userfiles/files/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-ban-people-on-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/50-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/get-free-coins-for-coin-master_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
stream_002_off000032c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C9 23440 bytes
SHA-256: 09d956aa3b0986e5459e8f7269c1cf4fd107594c65b3671fb74a9abbc4e4f8de
font_01_sfnt_off000067ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67CE 18180 bytes
SHA-256: fe5faf096fe3f8eea0cf960f18ddf18038ed4351badbb5629a61fc3e1c4a5749

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