Malicious PDF — malware analysis report

Static analysis result for SHA-256 af902710348f6099…

MALICIOUS

PDF

43.1 KB Created: 2020-10-26 18:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4a5817c1fa0caaecb8e04a88194e78ff SHA-1: 9eb884e64694c36674a03392adb9052dd8d2ff92 SHA-256: af902710348f6099eade9d54ed245cf8c26bfcc97e8cc742e69f42902460ead8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external websites designed to host or redirect to malicious content. One prominent URL, https://gettraff.ru/strik?keyword=digimon+apk+download, is identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of generated links, suggesting a campaign to distribute content through SEO manipulation. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score strongly suggest malicious intent.

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://gettraff.ru/strik?keyword=digimon+apk+download In PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/d52a3.pdfIn PDF document text
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/muzakotijowaxeroxe.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/35b4f1600cf.pdfIn PDF document text
    • https://vilemanunopabom.weebly.com/uploads/1/3/4/3/134317174/5451248.pdfIn PDF document text
    • https://raxabebawozovi.weebly.com/uploads/1/3/4/3/134311701/feleseranuke.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/8d5f6f11.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/3347896.pdfIn PDF document text
    • https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/jupumepuravaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5f8c939378cc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f89acf7c2088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5f8dcadcb300a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f92432aad9d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401994/normal_5f91db931f2bb.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/1/0432/3019/9966/files/the_biology_of_skin_color_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5417/7185/files/scratch_pad_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/6964/0356/files/french_speaking_tour_guide_jobs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/wave_optics_formulas_slideshare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8603/6126/files/87182881764.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_off00006904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6904 5160 bytes
SHA-256: 50577f4e4b46aa0ce042341bcf4119e9514ce9a69259ff5929199b6db09d5c16
font_01_sfnt_off00007a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9D 10832 bytes
SHA-256: bd904cfb601fad19d0c5ca35f162833f446ba57b2fd9afc8593d7f5fe63d40e9

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