Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbf705822118b65…

MALICIOUS

PDF

44.2 KB Created: 2021-06-13 15:35:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f6945d5d6f0e026865b0e2d68d926807 SHA-1: 8b61738f50426adc5932f1ef342f1c918393f714 SHA-256: 8fbf705822118b6534a5bc64a5797e04e3565f1a2e781ad76b0b2873e94bec1b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/free-promo-codes-for-robux-game-hack. The document body and embedded links suggest a lure for free game-related content, such as 'free promo codes for Robux', which is a common tactic for distributing malware or conducting phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.co/app/431946152/free-promo-codes-for-robux-game-hack In PDF document text
    • https://nexsoftech.com/upload/userfiles/files/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/can-pokemon-go-free-account-2021_GM1094591345.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/how-to-hack-mad-games-roblox_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/pubg-mobile-uc-qatar_GM1330123889.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-robux-app_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/roblox-legend-of-the-fallen-kingdom-2-rpg-cheats_GM431946152.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://nexsoftech.com/upload/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_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_off00005005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5005 25220 bytes
SHA-256: cb7bcf4bf99c9b4688f32956a154ab43d3ba70e7c218b475bf21d73a8a07e9f8
font_01_sfnt_off00008928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8928 18604 bytes
SHA-256: f71c03fba91376071fb946d88a6d16afcc2c6d61aa4ef632c3571b6200829f5d

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