Malicious PDF — malware analysis report

Static analysis result for SHA-256 4850892911e4512d…

MALICIOUS

PDF

45.1 KB Created: 2021-06-09 09:51:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d22bf67931ed6584f7b5e0bf1028b605 SHA-1: 6cc541490e4ae33a17d7d71c666504b506d164a8 SHA-256: 4850892911e4512de3d9009cfbb1c99826f174369b0bba4abb5424af7a3648c3
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 0.9865

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-robux-no-human-verification-no-survey-2021-game-hack PDF link annotation
    • http://www.dciprotection.ca/images/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.dciprotection.ca/images/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://www.dciprotection.ca/images/how-to-get-free-robux-without-getting-an-app_GM431946152.pdfIn PDF document text
    • http://www.dciprotection.ca/images/how-to-cheat-money-on-roblox-retail-tycoon_GM431946152.pdfIn PDF document text
    • http://www.dciprotection.ca/images/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • http://www.dciprotection.ca/images/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://www.dciprotection.ca/images/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.dciprotection.ca/images/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://www.dciprotection.ca/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.dciprotection.ca/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.dciprotection.ca/images/tiktok-free-crunchyroll_GM835599320.pdfIn PDF document text
    • http://www.dciprotection.ca/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.dciprotection.ca/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.dciprotection.ca/images/tiktok-free-crowncom_GM835599320.pdfIn PDF document text
    • http://www.dciprotection.ca/images/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://www.dciprotection.ca/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://www.dciprotection.ca/images/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://www.dciprotection.ca/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://www.dciprotection.ca/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.dciprotection.ca/images/roblox-jailbreak-hacker-cage_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000520c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520C 24444 bytes
SHA-256: 3f2b6de76d8a38c42cbc03c4578f7c497437a22b7e5c0488a901bb348af595ca
font_01_sfnt_off000089af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89AF 19556 bytes
SHA-256: ab503fbea226113e89ebe2ea140ebf10dc9aa9a1109ee06ff2d9c89a9189fb10

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