Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c35f25fb2d07b1…

MALICIOUS

PDF

46.2 KB Created: 2021-05-15 10:36:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9bac4bc0bbc4ff08a061d878abceef57 SHA-1: c943000e1f3e108472acb03ceef49f5dc3520523 SHA-256: f0c35f25fb2d07b186f5ad4087245d0ec09f7d70db76ed72bf0ce14e219c9fb2
208 Risk Score

Malware Insights

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

This PDF document employs a lure related to "game hacks" and impersonates Facebook to trick users into clicking malicious links. The primary link, https://netcdn.xyz/app/431946152/how-do-you-hack-roblox-game-hack, is identified as a malicious redirector. The document body contains numerous other links, predominantly pointing to the `lacarla.dk` domain, which also host PDF files related to games and free items, suggesting a campaign distributing potentially malicious content or phishing pages. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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/431946152/how-do-you-hack-roblox-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/431946152/how-do-you-hack-roblox-game-hack In PDF document text
    • http://www.lacarla.dk/images/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://www.lacarla.dk/images/com-roblox_GM431946152.pdfIn PDF document text
    • http://www.lacarla.dk/images/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://www.lacarla.dk/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.lacarla.dk/images/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.lacarla.dk/images/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://www.lacarla.dk/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.lacarla.dk/images/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • http://www.lacarla.dk/images/coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.lacarla.dk/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.lacarla.dk/images/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://www.lacarla.dk/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.lacarla.dk/images/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • http://www.lacarla.dk/images/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • http://www.lacarla.dk/images/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.lacarla.dk/images/where-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.lacarla.dk/images/coin-master-time-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.lacarla.dk/images/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • http://www.lacarla.dk/images/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdfIn PDF document text
    • http://www.lacarla.dk/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47DE 32860 bytes
SHA-256: f49f3a7e4409995cb5029a4358256ed79986fe3c098ceae7cdd8dfb076c858ba
font_01_sfnt_off000090ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90EF 18816 bytes
SHA-256: d27b94fe1a8c05d6feb56d9a091a96145976f0feb7173cb46f16c8470fe3a7d8

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