Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcd726f373d95b3…

MALICIOUS

PDF

57.1 KB Created: 2020-08-14 00:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b13a4b0c288a3f4b4e582981260d6f5d SHA-1: 5d74bcd59f49f21284c0839d470479f801a5b813 SHA-256: 5dcd726f373d95b39146f18ef5a2004082a1fd1ecd77b521f00ba2ff2d622ec2
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics, suggesting the document's primary purpose is to lure users to malicious content.

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=cheiro+de+amor+alinne+rosa
    • http://revizew.storiasia.com/uploads/1/3/1/8/131871390/6232272.pdf
    • http://files.henhouseart.co.uk/uploads/1/3/1/4/131438323/e9a7b39d6f.pdf
    • http://files.kirbyonpolitics.com/uploads/1/3/0/7/130738836/nenud-sumaxarulerolox-dijagesetupol-nagosofusufob.pdf
    • http://files.kayakgreenecounty.com/uploads/1/3/1/4/131438891/jiref_rewobapurav_dogimafix_zemerukutudex.pdf
    • http://files.johnathonqswanson.com/uploads/1/3/1/6/131607805/6057483.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/53952729776.pdf
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/landscaping_proposal_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/zewipexexabedupevipozuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/1451/1001/files/mathematical_ideas_13th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/tuduro.pdf
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/nobisejetawe.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0823/files/nalotijesa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3669/files/girawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/totem.pdf
    • https://cdn.shopify.com/s/files/1/0436/2836/3939/files/14136850934.pdf
    • https://cdn.shopify.com/s/files/1/0439/3389/2763/files/22051773539.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.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_off0000a34a.bin
91fd19c61bf63897ee1881a04804d6ad868ecf4a9f6b57a2e9c3286f4e87faf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA34A 4972 bytes
font_01_sfnt_off0000b404.bin
344b514ade018eeded54734f70bd00ddff4306b532c1240867de554e287c63f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB404 10376 bytes

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