Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf60624bf67c8c6…

MALICIOUS

PDF

32.7 KB Created: 2020-11-02 01:34:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 332a9b8fe958b227235a32b5666c9370 SHA-1: ea70f9909eca9db985f1d16ed4c0ca419b05c002 SHA-256: ecf60624bf67c8c6125cf2457125d6136c35954f80e4eaeaecba227f97ce9281
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to link farms or redirectors, indicating a malicious intent to direct users to potentially harmful sites. The primary malicious URL identified is https://cctraff.ru/aws?keyword=slope+google+sites+unblocked, which is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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/aws?keyword=slope+google+sites+unblocked In PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/pabagugiridepoluwaru.pdfIn PDF document text
    • https://kikuvabafot.weebly.com/uploads/1/3/4/3/134332304/renufomevin_wutimerivew_kojupabikagika_kokimawawa.pdfIn PDF document text
    • https://giximelet.weebly.com/uploads/1/3/4/2/134234701/9975096.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/1594757.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/nuvuk_rizar_rulegunozibewem_fuxalupepa.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/1/0493/5948/7135/files/gevomuxiparosises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8083/5765/files/illinois_new_tax_law_on_cars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/228cf102-1cb0-44e8-9f4d-8a868e4a1769/divigur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fd7ea8-a606-48c2-87ec-9f259b95adec/58281619982.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3210/5119/files/52246769938.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/sandia_peak_nm_weather.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/9918/5312/files/gusosilagesametonisif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8775/5432/files/sea_turtle_swimsuit.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_off000044d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44D3 5244 bytes
SHA-256: e3a5c175dd6a4f67f6f876a53a007c54615c8da7f67a312430dfad6572765a87
font_01_sfnt_off000056bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56BD 9348 bytes
SHA-256: 78164b528cfb267282735ad1dd4877bf0b12bbcda658a9988440a7c33cf66e92

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