Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fea9087de3ef222…

MALICIOUS

PDF

46.7 KB Created: 2021-05-11 18:30:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 993cf71af8dd42cb49e2590a9bf8e7ab SHA-1: cb8bee495f20ed907de3c42ba4b8ef65c4370834 SHA-256: 5fea9087de3ef222d5affc341b9707e8fbfc1564d66c4a437c35665a29f4ca8d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on them by promising game hacks and free currency. These links redirect to malicious infrastructure, including a known redirector, and a large number of other PDF files hosted on a link farm. The primary lure appears to be related to 'Coin Master' and 'Robux' cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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-hack-unlimited-spins-and-coins-cheats-game-hack In PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-blogspot-free-spins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/minecraft-free-games-no-download_GM479516143.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_off00004dee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DEE 25592 bytes
SHA-256: a509e28f191305db06f55febc2520303219bc0d3b7e1c74ea19ddcc6b25c2f73
font_01_sfnt_off00008802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8802 3124 bytes
SHA-256: 9967c6221325a4ff3f7c4336922605f990450164c2eee2df708cc81823c6ec98
font_02_sfnt_off000092e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E1 18752 bytes
SHA-256: a5aec5b248ebf18d124a3553706da1b452fa76c75010bd29e6f2a67b685d44b8

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