Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b80f7523ba710d2…

MALICIOUS

PDF

45.7 KB Created: 2021-05-14 08:08:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5532c0655cf2a0927875ceb83d727d56 SHA-1: b9c697eb8e538d4a2be98e1ca549d54cb98f2aa6 SHA-256: 8b80f7523ba710d2f3865b76ad46333bbaf72d522d158d75bf8777be053eff49
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to external sites, including a primary redirector associated with malicious activity. The document body and heuristics indicate a scam targeting users with promises of game-related benefits, likely to monetize through ad clicks or further malicious redirects. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.
  • 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.xyz/app/406889139/coin-master-free-spins-today-daily-links-game-hack In PDF document text
    • https://europainstitut.hu/images/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://europainstitut.hu/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://europainstitut.hu/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://europainstitut.hu/images/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://europainstitut.hu/images/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://europainstitut.hu/images/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://europainstitut.hu/images/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • https://europainstitut.hu/images/free-roblox-intros_GM431946152.pdfIn PDF document text
    • https://europainstitut.hu/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://europainstitut.hu/images/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • https://europainstitut.hu/images/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://europainstitut.hu/images/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://europainstitut.hu/images/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • https://europainstitut.hu/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://europainstitut.hu/images/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • https://europainstitut.hu/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://europainstitut.hu/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://europainstitut.hu/images/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • https://europainstitut.hu/images/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • https://europainstitut.hu/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a51.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A51 24240 bytes
SHA-256: 327274e404a3d60413047c2f00af961cbbe00fbaa5a8aeab0870c4bdea293c8c
font_01_sfnt_off0000817d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x817D 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off00008f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F04 18652 bytes
SHA-256: 52d597ff4b9023df6b3510b92f87dc1d2329aed0448bc9fa59130058567cb992

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