Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2cef57f65e7f00…

MALICIOUS

PDF

41.5 KB Created: 2020-11-03 06:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d3b12ed10631c41f8ebcc265caf86394 SHA-1: 38e938f9850190220809b2a54dc52ee0b07c28e2 SHA-256: 1a2cef57f65e7f00c936e2e7fc7670e19b7b7922c83c61ab8fe7256532649379
94 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, https://cctraff.ru/strik?keyword=image+citation+generator+apa+from+url, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains this URL and other benign-looking URLs, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=image+citation+generator+apa+from+url In 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/1/0266/8232/7221/files/burp_cloth_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dbea87-252f-45ce-b2fa-756aee1f28c9/chettinad_chicken_curry_recipe_in_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/41998433208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9dff0bd-1ccd-48d9-81b2-321883271f45/15637137791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/babb4b86-a826-483a-b6b7-0551b94fac14/45165107514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07210d7a-a5a5-4d13-bdf1-d8be4a85e273/jabedose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319e2011-82df-458f-bd51-800976997d00/tfw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaffa94a-7f35-42b3-b09a-d49ea4c3384f/juferozar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/2594/5516/files/gre_prep_plus_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d99682-37a1-4128-8653-26da854f29ec/mivisirifoxureguzoloz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/7168/5027/files/pubg_mobile_wallhack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/96018120810.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_off00006422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6422 5096 bytes
SHA-256: 0a560bd9b7aecd78b5be16c6ee95e77903b2031a316fce994045673d52d0f902
font_01_sfnt_off00007565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7565 10632 bytes
SHA-256: 648d1b21c7eed4143dc631a66c906a03570176b00465e330b8728e5506a647ca