Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e855579d5731f6d…

MALICIOUS

PDF

59.4 KB Created: 2020-10-04 22:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cd886719fa86686b11d11830b36562c6 SHA-1: 74c58c822af87a56a0249e751a3211d653190d5f SHA-256: 3e855579d5731f6d8c1263ee938875eaf1941910181197601ab325cca78f37ac
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/strik?keyword=michael+bednarsky+wikipedia'. The ML classifier strongly indicated maliciousness, and heuristics identified it as a malicious redirector and part of a link farm on disposable hosting. The document body, though heavily obfuscated, contains the malicious URL, suggesting its purpose is to lure the user to this external resource.

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 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://ggtraff.ru/strik?keyword=michael+bednarsky+wikipedia In PDF document text
    • https://site-1036951.mozfiles.com/files/1036951/65921370465.pdfIn PDF document text
    • https://site-1039173.mozfiles.com/files/1039173/39064450096.pdfIn PDF document text
    • https://site-1037085.mozfiles.com/files/1037085/bubigexitaxap.pdfIn PDF document text
    • https://site-1036737.mozfiles.com/files/1036737/sesepo.pdfIn PDF document text
    • http://files.ccwaite.com/uploads/1/3/1/8/131857544/zubewirokamalipon.pdfIn PDF document text
    • http://mizobotov.arcguam.com/uploads/1/3/0/7/130739732/515468.pdfIn PDF document text
    • http://files.aphroditebyjalynn.com/uploads/1/3/1/8/131871467/3534f892f11dd5f.pdfIn PDF document text
    • http://files.randomcommunications.net/uploads/1/3/1/4/131483245/dadofutak-rusisa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0808/5144/files/the_backyardigans_break_out_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1815/6192/files/portal_frames_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5085/9670/files/vowejezitodizafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e381dc-2e3e-4e67-9a66-f8e5a2caf7a5/kibibirolas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54124749-e30a-4916-ab45-281c510f29da/segivupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/617a6524-b7ec-41cf-83e9-db71ec28cd20/nemapak.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_off000084c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C4 5564 bytes
SHA-256: 2fd4e9183813a2eae2423658df524c19ce3a24e6eb003a02ce00cb4dbdd34555
font_01_sfnt_off000097c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97C0 15420 bytes
SHA-256: 2d76b478f789bc33520bbf706d660172ba2a048b5a48898ca27a0374b2e1672c
font_02_sfnt_off0000c874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC874 16980 bytes
SHA-256: d5daf61ac6ea609425fbb5b12238872980bd0cf5e994337ef650038b13097d67

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