Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e383a3414dcc19…

MALICIOUS

PDF

33.6 KB Created: 2021-07-07 13:53:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a16a5e24469c71f878c895992166af1d SHA-1: aafa3d91f9036fc253513affde3b74ad77cfdb99 SHA-256: 76e383a3414dcc19905485449069297a914c519a35ccc5cbcceca9867c8315ad
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-free-spins-hack-game-hack PDF link annotation
    • https://delsys.com.tw/image/data/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/hack-coin-master-game-apk_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/2021-roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-hat-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-no-wait-works-proof_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-free-eminem-clothes_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-brick-bronze-cheat-engine_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-32-hack-apk-download_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
font_00_sfnt_off00002efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EFB 22304 bytes
SHA-256: b0023689e34139cb0b627b841adc187bb6baeb64caa8901083a94a063e3216bc
font_01_sfnt_off0000608d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x608D 18344 bytes
SHA-256: bda74eba5f039297e511dddd57f660cdccd001576784cab1ba2dc4ebdf08fb85

Open this report in the interactive analyzer, or submit your own file for analysis.