Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ab1eb072d41d50…

MALICIOUS

PDF

40.2 KB Created: 2020-08-30 07:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b11a4b4cfda92c117da22161cc97440 SHA-1: a5787a52bb9ba3d828e8819f8cd99e73ed8e05c6 SHA-256: 85ab1eb072d41d5014c9551760dc99e50425c458836089a22dba6ad41c6152b0
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 infrastructure. The primary malicious URL, "https://ttraff.ru/wix?keyword=brinks+analog+timer+instructions", is flagged as malicious. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a link farm or redirection scheme. 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=brinks+analog+timer+instructions
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/73cb9e_3539e63be7514c50bbbcdc978f1f77fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_51e65490c53b4a0c88aa030be9b7a340.pdf
    • https://static.usrfiles.com/ugd/1be480_714d84130829484895de97fe9912258a.pdf
    • https://cdn.shopify.com/s/files/1/0429/1064/6435/files/benim_hocam_tyt_corafya_video_ders_notlar.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/navamobimoxogaj.pdf
    • https://static.usrfiles.com/ugd/3cb679_d8e7613b350140629d0b4fd3ac2b11fc.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_b88e303b583d4c8788cb2c06e10b0aaf.pdf
    • https://static.usrfiles.com/ugd/2e16aa_14620b89e65945bbb2e03790d8681049.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e2e6b0912134568aff75c40f4e97309.pdf
    • https://cdn.shopify.com/s/files/1/0431/1891/9837/files/worksheet_about_demonstrative_pronouns.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6974/files/6661147185.pdf
    • https://cdn.shopify.com/s/files/1/0435/0027/3830/files/90962659991.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_off00004640.bin
cdb104aa3c4ca8a83fab5675221b57a67f2fb88514524c32b0427ae2c9892cc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4640 5232 bytes
font_01_sfnt_off000057f6.bin
7b17b828b76299f54e0541dbc6cba731f7a052fe5af7c8ad17a376e72639ce69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F6 10684 bytes
font_02_sfnt_off00007ba9.bin
df51e7a96bac719efb9735d4dc28c2abd92beaec5a43e6618c9e35307a8eb447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA9 16904 bytes

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