Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa3fef3e7bfa82a…

MALICIOUS

PDF

55.4 KB Created: 2020-08-31 18:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 156ac3c3b72dedd854c5feac38ba9304 SHA-1: bccbab2ba8a773dc57302252f2d78bb299fb73dc SHA-256: 6aa3fef3e7bfa82a73dd6ee20e2fc23e7d09a65f31bcf85e63becc2d6aeab56a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=esophageal+stricture+dilation+guidelines'. Additionally, it exhibits characteristics of a PDF link farm, suggesting an attempt to distribute or redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the embedded URL is the primary indicator of compromise.

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=esophageal+stricture+dilation+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0a593f_9b74890be8bd49ce9e34040d7fc2b7a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9014f6f1a234e708e17ecb817c429d1.pdf
    • https://static.usrfiles.com/ugd/de65f7_1fe6a84d780b40988e7e4e0ed15cb15d.pdf
    • https://static.usrfiles.com/ugd/b13fd1_e193fb8cae59485b8fefe9d975a666bf.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/odevzdn_bakalsk_prce_upol.pdf
    • https://cdn.shopify.com/s/files/1/0440/8321/6549/files/19176899301.pdf
    • https://cdn.shopify.com/s/files/1/0435/8576/5533/files/mezugimu.pdf
    • https://cdn.shopify.com/s/files/1/0459/2192/7319/files/jamoroledoxapew.pdf
    • https://static.usrfiles.com/ugd/822ecd_b73db08ccd954761bb087643fcfbcaad.pdf
    • https://static.usrfiles.com/ugd/80bfa9_9010b25af8c44fbfa86b55bf7be0cfac.pdf
    • https://static.usrfiles.com/ugd/a1fb72_566fb19c7c454227bceb9398bac79730.pdf
    • https://static.usrfiles.com/ugd/a86d68_74d4dfea9aa54258aabdb0367fa791f1.pdf
    • https://static.usrfiles.com/ugd/48f461_7e46c39a568747ceab98379d210325da.pdf
    • https://static.usrfiles.com/ugd/5ad03d_6347b2bcee204da5a6071c015f55f05a.pdf
    • https://static.usrfiles.com/ugd/72b0e7_a110ba247be54719ab9ccbe96e870bc9.pdf
    • https://static.usrfiles.com/ugd/40512e_78595bc0e8fb4456a701cb0a4343eee0.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_off00008548.bin
0fa2e65427cdf7bb48b13b1b4f015bc370985002ed77aa084f9797a11564f2f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8548 5292 bytes
font_01_sfnt_off00009744.bin
90752103d844481702a7d2e11ade0052f7798f3662a8901e55702be934c9d102		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9744 10604 bytes
font_02_sfnt_off0000baca.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBACA 16204 bytes

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