Malicious PDF — malware analysis report

Static analysis result for SHA-256 02955b0f58861235…

MALICIOUS

PDF

34.9 KB Created: 2020-08-11 19:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdada943643f7252a76f8c2db3b9eaa9 SHA-1: 4a0997323fe59212ca8cc64711d3584bb4360a9e SHA-256: 02955b0f588612352235e631a884459320dd5d206f0944008bb622fa96f7116c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute content or lead users to malicious sites. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found by heuristics.

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.cc/wb?keyword=pre%20intermediate%20english%20conversation%20pdf
    • http://files.debratsairealty.com/uploads/1/3/0/7/130739758/riboraxafe-bevov-gazununofirof-jojekiwonalok.pdf
    • http://kesow.brian-connor.com/uploads/1/3/2/6/132681670/xupisuresudefam_wenomoz.pdf
    • http://gajopol.anetagrygarova.com/uploads/1/3/1/3/131383657/46efd3fca.pdf
    • http://xiteba.ceha.org/uploads/1/3/0/8/130874067/7018214.pdf
    • http://pumored.cezannelandscapediscovery.com/uploads/1/3/1/8/131872225/vonekuvademuwu-nepebeg-fajaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/sovojidizisetokosepazumor.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/22506802184.pdf
    • https://cdn.shopify.com/s/files/1/0438/6550/5952/files/airway_breathing_circulation.pdf
    • https://cdn.shopify.com/s/files/1/0429/9731/7783/files/51622469423.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0724/files/traduction_anglais_franais_google.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/50_esl_board_games_and_templates.pdf
    • https://cdn.shopify.com/s/files/1/0438/4368/2469/files/41655654754.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9841/files/91116215172.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/59697317519.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/durability_properties_of_concrete.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5103/files/supekeronidosimaxoluri.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a55.bin
abb9d93530d372108701608e18d74c825fffdc3d70c443b64cacaa4e210a8838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A55 5632 bytes
font_01_sfnt_off00005d4c.bin
b567b0008ff79009b727a14d43f2ae87fe79efeb1b83a16ab2c086b608df2c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4C 9828 bytes

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