Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c8ef01d584e6d2…

MALICIOUS

PDF

46.1 KB Created: 2020-10-26 11:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 66a8c605ebe4fb60d03972b57a8c60cf SHA-1: e570f2e07b43e7f1aa2f902699e09a06518feef0 SHA-256: 15c8ef01d584e6d2092748e11db994b96c489b16ce674fa6845d2df3f494378e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a keyword suggesting it's an architecture PDF. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the presence of numerous external PDF links indicate a link farm or redirection attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to potentially malicious 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://ttraff.link/123?keyword=sketch+drawing+architecture+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f9357992396e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_5f8dd2643f8e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f9031e7dfc3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f884144d77ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_5f94126a74fed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5f91c21e0c088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f8738c2f2943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5f94aa7cedba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_5f8fa720eb1fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f8a32bf4c56a.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/1/0428/5435/1015/files/36810634022.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7673/9782/files/chinese_style_of_management.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8170/3319/files/new_guidelines_for_aspirin_in_pregnancy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9746/4226/files/bruchrechnen_einfache_aufgaben.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/synchronous_motor_starting_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/banagize.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/cours_d_anglais_americain_gratuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85cb4519-bbe9-443a-b65d-0264a7cc2594/guvamutijojefonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1358ef32-0478-4875-b6dc-f254ba05672e/34390531543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea0f18c-0f1e-4e55-baa9-c6f8b0aa42f8/serivuruje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71268a59-0ffc-449e-8a32-58e72c6f25c3/bejevizaxazaloturatir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1993fe2-7a96-4c55-9661-7efe3f53edbe/garujuwex.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_off00007602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7602 5468 bytes
SHA-256: a8153fc26fa65199eafd387cdf56c5f724741513aff7390feafea3968c8643be
font_01_sfnt_off000088aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AA 10056 bytes
SHA-256: 5c0079fd19f9a98b350c08f70309fba538eb7d7fea29696f31da7e355d5fcf80

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