Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b6ea0e4c53064a…

MALICIOUS

PDF

91.2 KB Created: 2020-08-07 03:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d62b2ea3e90a8411dab307a9932f57f SHA-1: ce7e2cca8431cf1478ff4c3d6666ee73c3416057 SHA-256: 17b6ea0e4c53064ae20eae94e5e2d32fcd2ff8c26274b5dcfe052a5c89576fda
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.ru'. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or redirection scheme.

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/pify?keyword=karimi+aflatoxin+pdf
    • http://files.ollhschool.org/uploads/1/3/1/8/131871642/1566266.pdf
    • http://files.esandypowell.com/uploads/1/3/1/3/131384113/6520938.pdf
    • http://files.rachaeleggebeen.com/uploads/1/3/1/4/131407552/9bfda0ce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2512/9894/files/kakefemetegagoluximugele.pdf
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/dosodi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/jaxatubisavuvewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/79394584316.pdf
    • https://cdn.shopify.com/s/files/1/0433/7490/3452/files/89741387546.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/resij.pdf
    • https://cdn.shopify.com/s/files/1/0432/9065/6936/files/40165192308.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/rejidibidowujoxilavodab.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/9042253345.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/69368086607.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0486/files/java_integer_array.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/25233972793.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_off000109dd.bin
42f5acdb003c9822b394397162a4ee5e681f91223c01eaa0423e9884efbe0835		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 5048 bytes
font_01_sfnt_off00011b00.bin
e55ff6cfaa7e7e11b9e573bf994e738830df73fca5ee9828d6a7a74cd1fb21f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B00 15388 bytes
font_02_sfnt_off00014af6.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF6 16060 bytes

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