Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c5ede7bf50e74d…

MALICIOUS

PDF

45.2 KB Created: 2021-05-16 12:48:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c4160a47aa4a10c75754bd7ee89d055e SHA-1: 714d104eb7f3cb74cecf217cdbf0f67b3cf8efdd SHA-256: e2c5ede7bf50e74d71d8fd2c865abe05128b354fa605989ad68e46ef593bd127
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/479516143/minecraft-free-download-android-apk-game-hack PDF link annotation
    • http://sbm-nn.ru/images/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-invite-friends-hack_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-download_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • https://discord.ggIn 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_off00004a95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A95 24884 bytes
SHA-256: 0854872e21dff41f4270e3cc3001c592bf00078d71d21546721d5630a856ba66
font_01_sfnt_off0000837f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x837F 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00008d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1E 18636 bytes
SHA-256: 653028bcb0f2fb6608854d40a7a9db9360db480d39b3fa53a0b8dd523b133d01

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