Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bed99893b4925b…

MALICIOUS

PDF

43.2 KB Created: 2020-10-27 05:33:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 17760c537e8a77b6f22f8bf8e2d0a075 SHA-1: d5f50d7cbafa49bffd65b607d749d4c820b0ce80 SHA-256: 25bed99893b4925baea715d24af9ec4fc5f1e971e1a845f62e2918ad8cc06f2d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ggtraff.ru/123?keyword=cursive+capital+f In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f8e1253e0f91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f8737d80afe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f8b84206d256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f929948d12ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f931df9ac077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f95feaa99ea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5f9347cf20570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5f976230ca484.pdfIn PDF document text
    • https://bovitala.weebly.com/uploads/1/3/4/4/134497817/6840245.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/wovaviroruwuvi.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/2861442.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/xenemavurinap_jokepirewiteda_fijalezej_gemewije.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/1/0497/7888/4759/files/ps_vita_emulator_apk_pro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1926/2363/files/39504719892.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/noredezevu.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/organic_aciduria.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/calendario_serie_b.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_off000069d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69D2 4972 bytes
SHA-256: b49e7997177610d0794c5daa9f1dbdd9fc50c026f0dbe73b15edeeed892d80c0
font_01_sfnt_off00007ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD2 11424 bytes
SHA-256: 14172fbd8013e73bc174037b97d71eed7381f374f705c227109cefba3384e60c

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