Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9b8719a7bfb5f6…

MALICIOUS

PDF

51.3 KB Created: 2020-08-29 13:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbf1329d9dcf795cda4e18cd4d95b0f5 SHA-1: f4d07144e1d2bd28be9dbb5e2210c42dfa800500 SHA-256: 5c9b8719a7bfb5f65e8c069fe332b5a98ca87a239e0283476e98a34b79380447
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=ejemplos+de+bisilabas
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_3d8f19c115ae440c85890e15b3f8a894.pdf
    • https://static.usrfiles.com/ugd/cac9e4_4c70f5c2083f419489a134dbf0a5f99b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f30747a89bc433787fca59258c21f10.pdf
    • https://static.usrfiles.com/ugd/b8c837_47b01ea49aa74de1afedc2d82526b3a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f62fb131c4d48d3b25094930b6eda38.pdf
    • https://static.usrfiles.com/ugd/b8c837_c600590d24314c688e96f21fb110b748.pdf
    • https://static.usrfiles.com/ugd/b8c837_41a4300a82a9462787159e78bc8f7f84.pdf
    • https://static.usrfiles.com/ugd/b8c837_7e6b4f78c61047bbb36f3180580c07c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_0f9647ba841a420b8c60fec99e31e2db.pdf
    • https://static.usrfiles.com/ugd/b8c837_1796ddaa77c143c68fd607b0def975dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b878c887779543f4a71ac5a8fc8f2c2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a9e319c0919441899b43172727d5cb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b591ec52d39a4c9f9a80b3a5797639c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_53ad0ceb798c438fa9f6eac2e0efc926.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007125.bin
6bc2645a40cfcef1ba75bc29cc71ec60bcc36dc6c1847ee886631b1c42e31203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7125 5184 bytes
font_01_sfnt_off000082b1.bin
c9beaf93e20acf534b791f0e66566fb77406b8349bc10f7d7e25ad1590a9202a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B1 12440 bytes
font_02_sfnt_off0000a9b6.bin
6820151f9a4816bccc9e85e605aef44ce22c8924dfcccd161584754f275bf028		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9B6 16132 bytes

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