Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1338fb0a3ac53e…

MALICIOUS

PDF

46.1 KB Created: 2021-05-15 14:04:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ab1d532ccea5e2db5db6159540b29cc7 SHA-1: 6e2ca7407b2c7b6d5ad44e4f87931616586aa624 SHA-256: be1338fb0a3ac53eee6872b88909e93a0e9aa53047c791c388659fa3d8ce8dbc
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 0.9432

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/431946152/get-free-robux-without-doing-anything-game-hack PDF link annotation
    • http://krumerhaus.at/images/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/hack-coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://krumerhaus.at/images/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://krumerhaus.at/images/code-free-robux_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://krumerhaus.at/images/coin-master-cards-for-free_GM406889139.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_off00004a96.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A96 25236 bytes
SHA-256: 808281b0351001d343aeca52b89065882b22cf15be43ca03f2520cab3a603c54
font_01_sfnt_off0000846c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846C 2988 bytes
SHA-256: ec0b37834989d45a16554ea0b13d2733d9b07f2e4dc9d8d1bc6debf9eabd103c
font_02_sfnt_off00008ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBC 19240 bytes
SHA-256: a9e3aa10522a438dd9eef37bb3e7f322f16e38379d063b4a50e22a05dda2bc13

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