Malicious PDF — malware analysis report

Static analysis result for SHA-256 34263fe68b28e8cd…

MALICIOUS

PDF

48.4 KB Created: 2020-08-29 17:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a79aaf437dae9eefe5b618f2d404447c SHA-1: 2d0545ba0149d5da69a49c3054e4e7aff0cfd9ec SHA-256: 34263fe68b28e8cdcc147290653d2644360b6beb2648d9743ebf0f6d225e8551
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=ejercicios+simetria+funciones+3+eso
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5955/8053/files/fur_elise_flute_sheet_music_easy.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2102/files/17365387056.pdf
    • https://cdn.shopify.com/s/files/1/0437/1090/6518/files/mifebokarufipifiwek.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/87002933322.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/3212809136.pdf
    • https://cdn.shopify.com/s/files/1/0432/0398/5570/files/kuxasejemopaxudojabubisup.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7717/files/modizik.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/56886032337.pdf
    • https://cdn.shopify.com/s/files/1/0439/9228/5342/files/apache_spark_mllib_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/4634/5640/files/character_analysis_worksheets_for_grade_2.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd3b8e362a2e4060896fd3ae632f73cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_11de0c5dc2014f0196e3ad40bd25b310.pdf
    • https://static.usrfiles.com/ugd/b8c837_9770a0d22a4e4a09a2eacce114899031.pdf
    • https://static.usrfiles.com/ugd/b8c837_51e18f378204404bb747b8fc34048345.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_off00006120.bin
0c488090b1c348086b4d2588e9c39c402bb34f909c811c206f9018b177e20b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6120 5192 bytes
font_01_sfnt_off000072b6.bin
a75fdd9ce73214a677d4e77df8dbae4ffdcd4d88dfc4a91157a0a7f3a57ff8de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B6 13636 bytes
font_02_sfnt_off00009c8f.bin
38e20cfd9cd3ff5145f98550b5dcec461a552f99fada5d92fb473ba7d4ad0fc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C8F 16304 bytes

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