Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20f78f014bab217…

MALICIOUS

PDF

40.9 KB Created: 2020-10-19 15:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a6ec2bf86e791442cfb89a3792f0c94b SHA-1: 9a9cee8ece856575214d09b47797a0fc913ebec3 SHA-256: e20f78f014bab2172d75d7ce4f457d6f2bb19be5e32f9a454119d0473911eb4c
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, which in turn leads to a link farm of other PDFs. The document body, though heavily obfuscated, contains a URL that matches the redirector. This suggests the primary purpose is to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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/wb?keyword=2004%20yamaha%20raptor%20350%20service%20manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f889eb19d2d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_5f874a552c97c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5f8823cb838f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f8c838c877a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5f8c1ddd50bb5.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/4500422d60e37f.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/fisewoludemadijop.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/5e623.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/1/0495/5596/4056/files/complete_subject_and_predicate_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2499/8819/files/tennis_tie_break_explained.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5008/1690/files/login_with_facebook_in_android_studio_github.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6041/4614/files/gruyere_cheese_substitute_havarti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5657/8206/files/metrolink_la_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3692/4826/files/chestnut_hill_academy_washington.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7481/7693/files/jiluwilarikawijad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1615/5047/files/troy_bilt_string_trimmer_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2587/9199/files/10234772095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3746/1160/files/the_story_of_caedmon_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ac7c54b-dac0-4ba5-bddb-e88c181ce158/6163953783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d2badf-2647-45e4-b32b-d9a520d7b1b7/poxenarejap.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_off00005fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA3 5892 bytes
SHA-256: f7838a32c541c2ba0eb121c06e50c41cd963a7945705205fc693b463ac360eff
font_01_sfnt_off0000738f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x738F 10116 bytes
SHA-256: 9b830bb83cd9343d056131887ce94d2c5c8ea312e6a2f2c255d0cd290ab4410c

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