Malicious PDF — malware analysis report

Static analysis result for SHA-256 857b23e64091ae55…

MALICIOUS

PDF

52.0 KB Created: 2020-08-30 02:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0134eea9612980dc1300661508372165 SHA-1: 57e629a747af06a202f2a4cc329d87f6d97d68dd SHA-256: 857b23e64091ae55b84af6cb608409bfe8028c1055240cbe33e274b2770964be
154 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector, which is a common tactic for distributing malware or phishing pages. The document also includes a large number of links to other PDFs, suggesting a link farm designed to manipulate search engine results or distribute content. While no scripts were directly extracted, the presence of embedded URLs and the PDF structure indicate malicious intent, likely related to initial access via spearphishing.

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/wix?keyword=a+little+jazz+mass
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4151/3894/files/11123284284.pdf
    • https://cdn.shopify.com/s/files/1/0435/2727/4647/files/57855283258.pdf
    • https://cdn.shopify.com/s/files/1/0430/4456/9242/files/wokepoke.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a844f21c1624ec0968bceebf0a1ccdb.pdf
    • https://static.usrfiles.com/ugd/9e41f0_806bdda9a6fb404f8ad181b3d5386990.pdf
    • https://cdn.shopify.com/s/files/1/0435/2779/8943/files/wave_motion_numericals.pdf
    • https://cdn.shopify.com/s/files/1/0433/5845/3918/files/the_afterlands_maplestory_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/lowaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/9067/1771/files/rn_pocket_guide.pdf
    • https://cdn.shopify.com/s/files/1/0449/1155/8811/files/unidad_de_almacenamiento_definicion_informatica.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/lofamukupajobopasepofore.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/worefigobatide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2865/1938/files/zelobovejez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005997.bin
88ea9c5a68180b32cf074d4ee3f196b59407153794f6269fc861744f783ba596		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5997 16352 bytes
font_01_sfnt_off00008d98.bin
84b37d631537a1eb63eae0f125ee58e75d2f9d13d3653aa644609b7695993cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D98 4852 bytes
font_02_sfnt_off00009e0f.bin
42a2d0aa10affc01b0d5c52c0a802774c6069ed54e1a5f31bbb9bae30d740c1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E0F 10304 bytes

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