Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1ddc5a7b3e1b1a…

MALICIOUS

PDF

58.3 KB Created: 2020-10-25 03:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5fe4b130bd2e391680476892bc6b6a3a SHA-1: 927c6fe62a8eebae2cd22fa733cf6ce48c2629d2 SHA-256: cd1ddc5a7b3e1b1a489f9dfe74b586284fe19f03c745e9d8f1f710cc66dfe0db
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users to a potentially harmful site. No scripts were extracted, but the presence of embedded links points to a phishing or redirection attack.

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://gettraff.ru/strik?keyword=best+e+reader+2018 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/53645561461.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/statistical_analysis_of_medical_data_using_sas_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/oil_bunkering_in_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/20107341325.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/2123511525.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/vudurotekagow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28261d6c-4e0d-4ae3-b7a8-033b43f81fb0/le_futur_simple_exercices_corrigs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c4a86a-1b74-44c9-8093-1679b9b4e6e1/cambridge_english_empower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d34677-3522-48bc-b7d4-d7fd28cc666c/zamivijawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac979eff-8cba-4297-a4ed-35de77722c59/dapokulufawelozogopet.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/ccna_notes_free_download_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/fikidufurupinulif.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/81142824338.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/a_level_environmental_chemistry_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/sigiku.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/gunikorokakefejural.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/jonadowofimajujime.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/business_plan_sample_ppt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7162/6652/files/rounding_to_the_greatest_place_value.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8526/1717/files/10700063079.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_off0000a5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5A2 5356 bytes
SHA-256: ed138516681b84a8ed8e9d61556a41c5d7283d9096d55fde7bb32e20510f4e8f
font_01_sfnt_off0000b7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E2 10748 bytes
SHA-256: d9a6c3f122f8b9aa354780688427a8760ad47fc0918a0ae5176a1ceadad55900

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