Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c427c57c590b4ce…

MALICIOUS

PDF

115.3 KB Created: 2020-08-10 02:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2796b48bdd897dd692ec289b1e009bf7 SHA-1: 6652ebb76467da35423d1cf2f216caa12ea00fe7 SHA-256: 0c427c57c590b4ce61590e21f00f67d229c9c31bab6a5964758cfc788492375c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=cell+biology+genetics+molecular+biology+evolution+and+ecology+pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to lure victims to a compromised site.

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=cell+biology+genetics+molecular+biology+evolution+and+ecology+pdf
    • http://files.dragonflyfloralschool.com/uploads/1/3/1/1/131164313/nabefuxipa_rixusob.pdf
    • http://pofona.bowenheritage.org/uploads/1/3/0/8/130874276/sixonolesa.pdf
    • http://files.timberridgeeqcenter.com/uploads/1/3/1/3/131380146/tovumi.pdf
    • http://meketa.lorilorion.com/uploads/1/3/0/7/130775934/vawimolip.pdf
    • http://xisetav.ps115jamesjambrose.org/uploads/1/3/2/7/132740405/5410784.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/86411913217.pdf
    • https://cdn.shopify.com/s/files/1/0429/5504/7068/files/29882828742.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/libro_di_genetica.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/jikuzasijifukebadat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/banen.pdf
    • https://cdn.shopify.com/s/files/1/0430/3382/1347/files/business_information_management_texas_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/3810/3962/files/pozujebesarixokabifik.pdf
    • https://cdn.shopify.com/s/files/1/0431/0358/4423/files/56931093614.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/18591576478.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73792904944.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_off00018067.bin
068392e7121f1374bea78726889ce29ee816411ce6f0db9444d6b01fe8edbd7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18067 5684 bytes
font_01_sfnt_off000193b2.bin
700ad70001b39f8ea0c41f17e62a5ee26abcdbe1a7a222163ba335ad2d3f193a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x193B2 13332 bytes

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