Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcca5ce20dc65f3…

MALICIOUS

PDF

45.1 KB Created: 2021-06-10 15:33:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 48eca4b2393f7b7683fba751151665f7 SHA-1: 497012fac7076a1002c6c479733737255fde7543 SHA-256: bbcca5ce20dc65f37546d91477d0852c5feacbfa5d1e8b8df6ffd66fba9cbcca
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-keycard-roblox-jailbreak-game-hack PDF link annotation
    • https://dirigentigiustizia.it/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/pokemon-go-free-coins-hack_GM1094591345.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-tiktok-hearts_GM835599320.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/roblox-jailbreak-free-car-scripts_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-coins-coin-master-hack_GM406889139.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_off0000527e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x527E 25128 bytes
SHA-256: 9ee912938b68bc664e0d0925aa7fa8f367537ec45532a410e5b6431c026e7546
font_01_sfnt_off00008bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCC 18984 bytes
SHA-256: 5934a7d99cd80252590585350f3ccd333e30de6d571ad7fa36ed1575ef46f766

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