Malicious PDF — malware analysis report

Static analysis result for SHA-256 524d768a2427195e…

MALICIOUS

PDF

41.5 KB Created: 2020-11-09 17:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d0f4bd0c696a7cfdcc02c7ee0aa60eed SHA-1: 9a09c393acfc658f53ae8b54bd89c74f61b3c8e8 SHA-256: 524d768a2427195e1802e5b301139c455e643019ead4cf53b3ef7765e6b3515f
76 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristics indicate it's designed as a lure for phishing or malware distribution, using the title 'Scientific method review puzzle answers'. The primary malicious URL identified is https://trafftec.ru/123?keyword=scientific+method+review+puzzle+answers, which is flagged as an external URI and part of an SEO redirector. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?keyword=scientific+method+review+puzzle+answers PDF link annotation
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/6171.pdfIn PDF document text
    • https://dududizenipurij.weebly.com/uploads/1/3/4/6/134651263/8802609.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/ef3e31983a1.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/9621677.pdfIn PDF document text
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/juwilewizetib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f87602ee61d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e8c406-8d59-4a72-9bea-42e72d7e759b/imperatif_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383e6cdd-46d4-489e-8336-030c1c60dbb1/71024851638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b943652-a4e5-4277-8639-938cad5b68af/8786057037.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_off000062c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C1 5700 bytes
SHA-256: ed3f38b7ed1708425acfce8b44efe830f75e4d2830fbe01a8b19c0c5c95dfffb
font_01_sfnt_off00007615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7615 10408 bytes
SHA-256: 55ce96b3cdd6f9767bfbe11f9d6f9cda66e82d8a01212f2a5d8e9d1d7b125d23