Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c059c0121a30528…

MALICIOUS

PDF

46.2 KB Created: 2021-05-17 21:17:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 80f56a06d2fcb2be177b62d204c4ad8f SHA-1: 02cc8c2d2d98638c2b1b08b3f9f3f1e0f0a2b115 SHA-256: 6c059c0121a30528194b59c034619a409ffa25cca2d5c19e5ebbdd76e5f240ac
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirector domains, specifically impersonating Facebook to lure users with promises of free in-game currency for Coin Master. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-pet-food-hack-game-hack, which is flagged as malicious. The document body, though heavily obfuscated, contains references to this URL and appears to be a lure for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 5

  • 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.
  • 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/406889139/coin-master-pet-food-hack-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
  • 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/406889139/coin-master-pet-food-hack-game-hack In PDF document text
    • http://krumerhaus.at/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/robux-adder_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/com-roblox_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/rbx-com_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/daily-free-spins-coin-master-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_off00004832.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4832 30712 bytes
SHA-256: e897e33a953cf7714329fef27d13200d196b775f4b2cc43ceb3bc3f092172f3d
font_01_sfnt_off000088ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88CA 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000927b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x927B 18208 bytes
SHA-256: e18efbdce36ef150d5aaea8ad3152999d2cd8d64b44f09ee0731d2d38d7a34d6

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