Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c995e3e52ea2b3…

MALICIOUS

PDF

44.3 KB Created: 2021-05-16 07:29:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 59316aa5a77b7d3cf31e79ff63112c8d SHA-1: c65c1a142f09664006bce38d76adeb9c35adf35d SHA-256: d7c995e3e52ea2b314d7166220f1e5318492140bb444bee2c1530283441a547a
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 https://netcdn.xyz/app/406889139/coin-master-spins-hack-iphone-game-hack PDF link annotation
    • http://www.homesweethome.pl/images/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.homesweethome.pl/images/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/robux-website_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.homesweethome.pl/images/roblox-admin-hack_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
stream_003_off000050cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50CB 25284 bytes
SHA-256: 129c99537c267e727dbb2a33e2b5562778a1e6a80d1eb3ac4c7cf5854b002737
font_01_sfnt_off00008bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB7 18060 bytes
SHA-256: e81d352b07e1ce097e3d885718cd431adb2fa9f9fe53d93d172b47981e22424a

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