Malicious PDF — malware analysis report

Static analysis result for SHA-256 77520f912d1cc85c…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 08:05:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8d3e70e1f8c3dc3a2d17e8765bcb74e8 SHA-1: f27176c5b78356e881daf197501b77aae4cde9df SHA-256: 77520f912d1cc85c1dbeff3d645f70dad3ca8dd74e57a059358b6fa93e2d88d7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free generators'. The primary malicious URL identified is https://netcdn.online/app/406889139/coinmaster-fan-page-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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 https://netcdn.online/app/406889139/coinmaster-fan-page-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hide-and-seek-hacks_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/www-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-imagine_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/rbx-hut_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-free-play_GM431946152.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_004_off00004eb3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EB3 24548 bytes
SHA-256: bfd21732883ce9917eec0fa48ab5266092221c58776d86453f421545ece9bbea
font_01_sfnt_off00008604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8604 2916 bytes
SHA-256: 166f6f46d61e77568a42a9071f26d38b0fc9948a144632b127366d684db984bc
font_02_sfnt_off0000901c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x901C 18412 bytes
SHA-256: 362c1088091ca1acb0efc5884e6feebbf648ceeb811ef0e2358676d84db8b2fd

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