Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c0d7b48199a90f…

MALICIOUS

PDF

42.0 KB Created: 2020-10-12 00:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 77bbaa91451e2111283c3c798daa1614 SHA-1: e02601777e82cac9b19720f1e50b747ca67c0a09 SHA-256: 57c0d7b48199a90ff586cc889d73fa71f94f28a41983ec748af7c5b2fc3ae861
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure designed to redirect users to malicious sites. The primary malicious URL identified is a redirector that uses keywords from search queries to obfuscate its true purpose. The document body itself contains garbled text but also includes the malicious URL, suggesting an attempt to disguise malicious links within seemingly legitimate content.

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/pify?keyword=realidades+1+capitulo+8b+answers+page+150 In PDF document text
    • http://files.mvcsc.net/uploads/1/3/0/7/130776592/gaduk_gegujupawaku_rowovakovol_buzetuwu.pdfIn PDF document text
    • https://site-1043581.mozfiles.com/files/1043581/xenarenitino.pdfIn PDF document text
    • https://site-1043660.mozfiles.com/files/1043660/jujoditukexovesakupirole.pdfIn PDF document text
    • https://site-1038647.mozfiles.com/files/1038647/rajijakegolon.pdfIn PDF document text
    • https://site-1036969.mozfiles.com/files/1036969/83057578404.pdfIn PDF document text
    • https://site-1039998.mozfiles.com/files/1039998/pawemoma.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/1/0437/9282/6517/files/moforofixelel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4115/9333/files/muscles_of_mastication_origin_and_insertion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1058/7296/files/77775932025.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1056/3485/files/75421981570.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4122/1525/files/fetujakanubugut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0284/2269/files/wam_2020_conference.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4417/0647/files/bounty_hunter_d_net_worth.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E0 5992 bytes
SHA-256: d3e081f34e509bfac94d819df1a121ce74be699ef13430a7bfba7c8aee973ef8
font_01_sfnt_off00007863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7863 10232 bytes
SHA-256: 9cd82d106e71e93ed01d189ffbf21e8ac03f0c51f2a91033713b58d1c2c3801c

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