Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b90ebbe304d7b31…

MALICIOUS

PDF

46.4 KB Created: 2021-05-19 18:36:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0be2c148b0120fac9a5a5a712e4e06fe SHA-1: 9025b8d31825566fce003bcc64006b8110edb4be SHA-256: 6b90ebbe304d7b312939321f6849525f48b68537d47f541b143a8d1973792f9b
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 brand-impersonation credential phishing. 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 0.8948

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-paying-game-hack.
  • 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/431946152/how-to-get-free-robux-without-paying-game-hack PDF link annotation
    • http://bibliodetki.ru/images/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://bibliodetki.ru/images/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-free-coins--spins_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://bibliodetki.ru/images/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://bibliodetki.ru/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://bibliodetki.ru/images/coin-master-free-spins-link-may-2021_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c7f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C7F 24520 bytes
SHA-256: b1d9664e601e66ad691956e3789823c9d20b1f44d5cd318db84ebe58ded77f10
font_01_sfnt_off000084e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E1 2896 bytes
SHA-256: 0f10adbf105d053971010bc1f17c4dd55814d599674c84f75a6eb4cb46a9c89b
font_02_sfnt_off00008ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED8 19616 bytes
SHA-256: cf429e2e91354d73b6f0728fc312d6ff4bad20be80a5ba6db32adcb01c969c4a

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