Malicious PDF — malware analysis report

Static analysis result for SHA-256 81323aaf477785ee…

MALICIOUS

PDF

41.7 KB Created: 2020-07-10 01:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c05dedb63992004e7442fe1830169dcd SHA-1: 596d8c5635b4f0f96f67fc893eaac924f5d6ece9 SHA-256: 81323aaf477785ee0cde2cddf74bf8e3390d81428a4d313c3a8fafe21b452365
184 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its function as a link farm, containing numerous embedded URLs. One URL, 'https://ttraff.com/wb?keyword=sing%20unburied%20sing%20online%20pdf', is flagged as a known malicious redirector. The document's primary purpose appears to be directing users to potentially harmful external sites, likely for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.com/wb?keyword=sing%20unburied%20sing%20online%20pdf
    • http://files.nosciastudios.com/uploads/1/3/2/6/132696621/vodib.pdf
    • http://files.751sttankbattalion.com/uploads/1/3/0/8/130814672/lorugaz.pdf
    • http://files.williammonaguenativeart.com/uploads/1/3/0/7/130739747/vunidegote.pdf
    • http://files.warriormassage.com/uploads/1/3/1/3/131383467/1626625.pdf
    • http://files.aromaacupointtherapy.com/uploads/1/3/0/8/130874055/kakilusufozot.pdf
    • http://files.pennyspetproject.com/uploads/1/3/0/7/130775520/jazotoxapomof.pdf
    • http://files.yourownfm.com/uploads/1/3/2/8/132815753/xexuko-wibejivolef-fujuminigukof.pdf
    • http://files.compass-quay.com/uploads/1/3/2/8/132815742/jazuruzejupise.pdf
    • http://files.southcoastlife.org/uploads/1/3/0/8/130874647/1ef42.pdf
    • http://files.filthmirror.com/uploads/1/3/1/3/131398279/8051a8fedbb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nizoxede.files.wordpress.com/2020/06/96326952733.pdf
    • https://nizoxede.files.wordpress.com/2020/06/37408911526.pdf
    • https://sarekuxiwaz591622790.files.wordpress.com/2020/06/xegegakakipurolufita.pdf
    • https://zunadawe.files.wordpress.com/2020/06/dumorore.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96704933611.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45366335679.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zisavugeti.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tosinumemelijigejidab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32506959796.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_off0000666b.bin
ff27db6416a07af1d8478a38e8562a8d40ec716f47931fe6710508237de06d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666B 5044 bytes
font_01_sfnt_off00007785.bin
3d3c14cf4914cd87eff6338f3b21dc2d69ae428682ba73d37467e93046ead04f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7785 10076 bytes

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