Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95aef6527e2d47f…

MALICIOUS

PDF

43.6 KB Created: 2020-10-03 22:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6d61eb76b7baa3e96f387a9407e3aaa SHA-1: ecacea4fedf92bcea1e4f44c1b91d58fccc45049 SHA-256: c95aef6527e2d47ffdb1d64afab644f3402d6358b51291abdc5cdf1b5d140788
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. The embedded links suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

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://ggtraff.ru/strik?keyword=air+conditioning+and+refrigeration+rex+miller+pdf
    • https://site-1037219.mozfiles.com/files/1037219/3403705554.pdf
    • https://site-1036713.mozfiles.com/files/1036713/49539942165.pdf
    • https://site-1036728.mozfiles.com/files/1036728/69649518555.pdf
    • https://site-1039268.mozfiles.com/files/1039268/22093932102.pdf
    • https://site-1039958.mozfiles.com/files/1039958/tulamabo.pdf
    • https://site-1039727.mozfiles.com/files/1039727/44904563319.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0486/6742/6966/files/jalopizitoju.pdf
    • https://cdn.shopify.com/s/files/1/0487/0927/1702/files/28451933832.pdf
    • https://cdn.shopify.com/s/files/1/0487/0927/1702/files/c2bfcuc3a1les_son_las_pruebas_estadisticas_parametricas.pdf
    • https://cdn.shopify.com/s/files/1/0437/8443/7922/files/area_of_shaded_region_worksheet_doc.pdf
    • https://uploads.strikinglycdn.com/files/a069c4ce-ee57-4ae7-9b24-06256a52bc84/61366396469.pdf
    • https://uploads.strikinglycdn.com/files/3d668c6a-243e-4c88-aa16-b9be019883f9/lafarowofufatididikituz.pdf
    • https://uploads.strikinglycdn.com/files/384a0d9a-8f05-4cc9-b024-e1f2a5eb755d/27965444264.pdf
    • https://uploads.strikinglycdn.com/files/bcfb122f-7786-42ea-a760-51676512eae8/74179937023.pdf
    • https://uploads.strikinglycdn.com/files/8f92a4dd-9abf-4592-9561-1e19276f2b03/jinetivi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000521c.bin
0ef4bf9889d3707d1971505a063cf1c1dc13468f6a85bdd7fba64486ffd69c06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x521C 5356 bytes
font_01_sfnt_off00006447.bin
084639ee8c35a40609e9796905aec12579fbf2cb1d6c9d043c25877c6eda4e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6447 10152 bytes
font_02_sfnt_off00008719.bin
d43e3ada652fb13890ce3962907ba2555b13da5596fd1ac3a94ff3c53ce5595a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8719 17436 bytes

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