Malicious PDF — malware analysis report

Static analysis result for SHA-256 134097c058c3fbd8…

MALICIOUS

PDF

33.4 KB Created: 2020-10-05 07:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03e3dbc3fe5385fdd4532b98fd941e2a SHA-1: 41d7317c5340b20e42ca92e04043905f1015446c SHA-256: 134097c058c3fbd8e755d2c325f371f77792e244c2a5ea537efc9c2b5854faa0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector and others forming a link farm. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with the heuristic findings, suggesting a campaign to drive traffic to malicious or SEO-manipulated sites.

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://gettraff.ru/strik?keyword=dessin+de+cochon+d+inde
    • https://site-1043973.mozfiles.com/files/1043973/puxisalekolupeso.pdf
    • https://site-1042737.mozfiles.com/files/1042737/zivetusegasixekobore.pdf
    • https://site-1039933.mozfiles.com/files/1039933/71991791949.pdf
    • https://site-1037028.mozfiles.com/files/1037028/97672879745.pdf
    • https://site-1036745.mozfiles.com/files/1036745/72734958044.pdf
    • http://files.mijunktiquescollection.com/uploads/1/3/0/7/130776326/jawuma-kutolupoxanodig-muwiwu-bixanisubexu.pdf
    • http://gagufoni.robo-design.com/uploads/1/3/2/6/132681268/fekazuwogeladil.pdf
    • http://wipodu.balancedpets.ca/uploads/1/3/0/8/130873851/4208939.pdf
    • http://files.mjremodel.net/uploads/1/3/0/7/130740097/4667188.pdf
    • http://vobugoz.bombblastsensations.com/uploads/1/3/1/6/131637352/jijopanejizad.pdf
    • http://files.atlanticglobal.com/uploads/1/3/0/7/130740231/mowiv.pdf
    • http://files.cornerboutiqueinmilan.com/uploads/1/3/2/3/132302944/247034.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/rogojowovurazosuwetogu.pdf
    • https://cdn.shopify.com/s/files/1/0481/9661/6344/files/universal_remote_rf20_manual.pdf
    • https://cdn.shopify.com/s/files/1/0495/5491/5488/files/15379918970.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4191/files/36344318346.pdf
    • https://cdn.shopify.com/s/files/1/0484/7524/2657/files/measuring_volume_worksheets_year_3.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_off0000480a.bin
bc8c6de5f426b786d41dec836ff553e67368ca5ed9e1819f72e985c0d7aee360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x480A 4688 bytes
font_01_sfnt_off00005803.bin
f9160d845d0b38238e7ae95b7177959d1a22bd1d2655805ce1383f5aae9ba963		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5803 9900 bytes

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