Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bae82db736d4e7…

MALICIOUS

PDF

49.1 KB Created: 2020-10-08 02:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5b27bbab404ddfc6fd51602a8886445 SHA-1: 733c36f920d88b3c4aa080f5a40f6cd1e42a5f5e SHA-256: 35bae82db736d4e7dfb8404d5bf3a2f1dd885648147134f831336e8524998dbd
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text and URLs suggesting a lure for downloading content, which is then redirected to a malicious site. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful sites.

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://cctraff.ru/strik?keyword=descargar+discografia+de+julion+alvarez
    • https://site-1039207.mozfiles.com/files/1039207/pawaxikol.pdf
    • https://site-1039646.mozfiles.com/files/1039646/10462141714.pdf
    • https://site-1036848.mozfiles.com/files/1036848/50121588637.pdf
    • https://site-1038541.mozfiles.com/files/1038541/43287998187.pdf
    • https://site-1037129.mozfiles.com/files/1037129/59582173155.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0495/6572/8920/files/daniel_reyes_san_antonio.pdf
    • https://cdn.shopify.com/s/files/1/0487/0891/1254/files/bsa_reading_merit_badge_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0497/3474/6263/files/taylormade_r1_driver_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/327fc24e-dd28-4ad6-bca7-199c0cd4fa4e/liwijuxaxeramutapalozexe.pdf
    • https://uploads.strikinglycdn.com/files/62416ea3-efec-4569-998b-e86ede65fdca/titukofekipedikupojizad.pdf
    • https://uploads.strikinglycdn.com/files/26ba7c83-73be-4474-87ae-436f0571c451/1523284513.pdf
    • https://uploads.strikinglycdn.com/files/aa29789d-952b-41c4-846e-7052af101e44/vuzijopumejagalisif.pdf
    • https://uploads.strikinglycdn.com/files/c177e4dd-2d87-498d-af19-09e11393460a/zivujarilanenosejuzemevok.pdf
    • https://cdn.shopify.com/s/files/1/0483/0809/3092/files/42902837410.pdf
    • https://cdn.shopify.com/s/files/1/0266/9477/9051/files/26964855117.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/81974476243.pdf
    • https://cdn.shopify.com/s/files/1/0482/9963/8945/files/whirlpool_duet_washer_codes_lf.pdf
    • https://cdn.shopify.com/s/files/1/0438/1281/5008/files/internet_safety_games_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007404.bin
1d395f8dce16a99c43f9562fb3d4b2e006a1ada61bb2746313b44fcd38ed915b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7404 5372 bytes
font_01_sfnt_off00008673.bin
a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8673 2140 bytes
font_02_sfnt_off0000904b.bin
bb6a108b220bd16a9b39f7c0156b191508a0a458efbcdbe88898f9e00859d98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x904B 11360 bytes

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