Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39504c72be313ac…

MALICIOUS

PDF

116.9 KB Created: 2020-10-04 11:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c7cf2c0f7a28b3fec12f7eff7ca8bdd8 SHA-1: f7177b8c9bed463edcf3a1034b359e6fe048ae47 SHA-256: e39504c72be313acf0ea8b07e72d608f07f6c39161e0237a1a137288b0b9a09f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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=mi+album+preescolar+tercer+grado+nue In PDF document text
    • http://files.the-college-closet.com/uploads/1/3/1/4/131407364/disudeluvaf.pdfIn PDF document text
    • http://files.nancysfreshcutmarket.com/uploads/1/3/0/7/130740318/68c2b223e1.pdfIn PDF document text
    • http://gizax.countrysideimplements.com/uploads/1/3/1/6/131606177/mejumijavodotat_piwilum.pdfIn PDF document text
    • https://site-1040516.mozfiles.com/files/1040516/saditut.pdfIn PDF document text
    • https://site-1038887.mozfiles.com/files/1038887/fokadotaparusalepedegak.pdfIn PDF document text
    • http://b��sica.sepIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/badc8c61-dab8-44c0-950e-2f14a5d512fe/6553029733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946ccdb5-7961-414c-a8ea-7ee67be26360/rodunajukujoganominuniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab17c0ae-6286-4d8a-9f5a-8f4994ac96eb/mebitazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13a80bd-194e-43b7-ab2d-3345e0f049a3/63919445749.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CAF 5540 bytes
SHA-256: d765ddea60f28aa483933e85767c5c1a9c9e095d1a177b99760386dfaf86c553
font_01_sfnt_off00017f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F6C 15256 bytes
SHA-256: f7e6a39069dc55ba2e22a7c2f9cecbf1758cc53cd84b503f20df4b0b1e9554be
font_02_sfnt_off0001aec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEC8 16304 bytes
SHA-256: 3cfa4012dd28574f826813e35942d42a7dc2f3e974ff549f9a361215a454513e

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