Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9d1d0b6c109204…

MALICIOUS

PDF

46.1 KB Created: 2021-05-10 20:35:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 61308f6c08f7cb30c4f097d796347eb8 SHA-1: 2364feea2f5674fc4cd8d71eaf166387b23002b7 SHA-256: 4d9d1d0b6c109204bb6eee05238f877b427a991f8c81cba9e3fbeda9c62b9c22
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 0.9432

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-free-attack-game-hack PDF link annotation
    • https://ccej.lviv.ua/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://ccej.lviv.ua/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://ccej.lviv.ua/images/ww-roblox-come_GM431946152.pdfIn PDF document text
    • https://ccej.lviv.ua/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://ccej.lviv.ua/images/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • https://ccej.lviv.ua/images/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://ccej.lviv.ua/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ccej.lviv.ua/images/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://ccej.lviv.ua/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://ccej.lviv.ua/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://ccej.lviv.ua/images/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • https://ccej.lviv.ua/images/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • https://ccej.lviv.ua/images/coin-master-hack-tool-without-verification_GM406889139.pdfIn PDF document text
    • https://ccej.lviv.ua/images/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • https://ccej.lviv.ua/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://ccej.lviv.ua/images/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • https://ccej.lviv.ua/images/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • https://ccej.lviv.ua/images/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://ccej.lviv.ua/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ccej.lviv.ua/images/roblox-hackprogamers-com_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_003_off00004b95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B95 29316 bytes
SHA-256: 1494fe18a8bdda5d2029922062175dc9a81567ae621a7a75f6b97de918dc60d7
font_01_sfnt_off000088e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88E3 2932 bytes
SHA-256: 6a728a9066ba65435d6380d78d87d8ee4d5553deba8217e5dee5b64eeb83287d
font_02_sfnt_off0000930b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x930B 17880 bytes
SHA-256: 96402d2e96280801386aa337121127c59561cdc8f458ec32dbe1421b57db916e

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