Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c58c5a0d797e85…

MALICIOUS

PDF

46.0 KB Created: 2021-06-03 05:28:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6192d533c5d9dee3e0feed5c9e387f0e SHA-1: e12841bb9f45abeba2f00b082aa376409ce6fce5 SHA-256: 09c58c5a0d797e85341f05cf9ed3492890c19a3a3ad7038a3f29cb7a3e90d344
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites that appear to be part of a link farm, designed to lure users with promises of free game currency or hacks. The primary URL, https://netcdn.online/app/431946152/free-roblox-accounts-with-robux-that-work-not-banned-2021-game-hack, is flagged as a malicious redirector. The document body, though partially corrupted, contains similar lures and references to the malicious URL, indicating a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • 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.
  • 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.online/app/431946152/free-roblox-accounts-with-robux-that-work-not-banned-2021-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-real_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/wurst-client_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-latest-version-hack_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_004_off000050be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50BE 25992 bytes
SHA-256: b33ec5554378a7a22a78f3d1368a010ea69fb0fd29c4f55d0aaab523eeca278e
font_01_sfnt_off00008d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D28 19652 bytes
SHA-256: 72c791ad1c4340ed85ac0ecdba514e35635851f3f818d4a167a4eafc97bf1d2a

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