Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ff158f07d5e67f…

MALICIOUS

PDF

48.1 KB Created: 2020-08-30 11:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6429bdced450cd4ce0cacae65bed4426 SHA-1: 2f41f346a9c44179eec234dcb004b0111e42e025 SHA-256: 06ff158f07d5e67fb184d9c4b169f350b343da5f8e9c30de5de479a0fa8767eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to distribute malicious content or phish users by directing them to external, potentially harmful, websites.

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=analisis+sintactico+selectividad+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/6cf392_bb5dc05b36c6470db6d99c2175ed5474.pdf
    • https://static.usrfiles.com/ugd/b8c837_05e8dd3f692e42dd9d7b98aabf6b5b1c.pdf
    • https://static.usrfiles.com/ugd/b916f4_5d3ecd084d054d30b54dbdebecaf0399.pdf
    • https://static.usrfiles.com/ugd/33a16d_ebfe6619c7d944beba1065afb9fa1a6e.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2646/files/dolulemiliwovonadexiro.pdf
    • https://cdn.shopify.com/s/files/1/0439/2629/0587/files/kojuxivokepevup.pdf
    • https://cdn.shopify.com/s/files/1/0438/0930/8829/files/24705769232.pdf
    • https://cdn.shopify.com/s/files/1/0433/8132/5987/files/37246675648.pdf
    • https://cdn.shopify.com/s/files/1/0431/0053/6986/files/goxogepewowejojotijidun.pdf
    • https://static.usrfiles.com/ugd/2e16aa_36492180c47d4163ad8303643ca22103.pdf
    • https://static.usrfiles.com/ugd/b4a829_cff0403a936544c093306c8386f017de.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbe8f2e849d34d49b248efd8a4b23e16.pdf
    • https://static.usrfiles.com/ugd/b8c837_311f7dd521204dd58dfe8bf5f63acd8d.pdf
    • https://cdn.shopify.com/s/files/1/0451/3038/3514/files/mivawevevoxefogesitovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3894/files/gomajojeroxavovago.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9277/files/adr_adverse_drug_reaction.pdf
    • https://cdn.shopify.com/s/files/1/0452/5362/3970/files/biochemistry_text_book.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_off0000659f.bin
4c98ac82207537e8385ac079ca3b711825c15a63a812656bbd44c9af3f0d57a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x659F 5104 bytes
font_01_sfnt_off0000770f.bin
58d55774adedf9ea3348a291b5fc149bfdd10cd48f9a481c7f38c4603cc995ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770F 11684 bytes
font_02_sfnt_off00009ce5.bin
5d72d630640305d452d914085fd6c65e0d8125198bed8028c282d44fd0327be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CE5 16068 bytes

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