Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c74e73a5f5605b…

MALICIOUS

PDF

50.4 KB Created: 2020-08-30 02:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 303cf41332aa67a12fef9795d6be5aaf SHA-1: 7cb71dff75d98d544476600716352cb6f30d3eac SHA-256: 61c74e73a5f5605b4ae0bc40c1031d41d6a72fe0b481a9821273a66f1e48344b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The ML classifier and heuristic firings strongly indicate malicious intent, specifically a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.club/wix?keyword=ejercicios+de+conversion+de+unidades
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/40b9e6_65d6e722c8ed477481761216f1361096.pdf
    • https://static.usrfiles.com/ugd/07625c_aa19621743634b4a9ef8975199d5116e.pdf
    • https://static.usrfiles.com/ugd/b58d21_41ae10fdde28442c81ab3cd37aed06ed.pdf
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/96782687448.pdf
    • https://cdn.shopify.com/s/files/1/0432/4484/7261/files/muruf.pdf
    • https://cdn.shopify.com/s/files/1/0440/5084/1750/files/xubuvadunejogov.pdf
    • https://cdn.shopify.com/s/files/1/0430/9277/0977/files/research_data_analysis_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2614/files/frozen_2_official_trailer_video.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/17652586595.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8872/files/wuneven.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6488/files/sakupumisitabunumot.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9292/files/40123625096.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7913/files/sagimunopuvowazibedunul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ef.bin
bde319f0ebf4e2aa335cde7e8c55703a290089166943a9fd3005c08ad956ef95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62EF 4992 bytes
font_01_sfnt_off000073f4.bin
8629e9f60c9142e9f78f1d5ea77b37a6dca227d105b7f6789003169742e763ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F4 3192 bytes
font_02_sfnt_off000080c0.bin
f4c0427393210bb4d5a8378aab60faf4f5f15f80b3d22dbf4dd17466ab169129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80C0 11284 bytes
font_03_sfnt_off0000a5a4.bin
42206083624803e6ea9bd12dec1b0a555271d8868cd998fa771abd630c8e6836		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5A4 16692 bytes

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