Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c11653b636888a5…

MALICIOUS

PDF

58.9 KB Created: 2020-10-29 17:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 797372da058994f46bb005849e6eafb3 SHA-1: df0b921e9015c4eb17ed8d78bd4ccc3bd3a2b7cb SHA-256: 6c11653b636888a571d618f8aa7e20500ccccb0d8b64aba6c6f7e954d40043f2
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://ttraff.ru/123?keyword=300zx+manual+climate+control In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f912841271ed.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/438bab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5f9a80542bdd2.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/ponuwovisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f8c46b255b5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f874898741c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_5f8b48a0bcc40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5f8fd090d30f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403951/normal_5f9ab2931cc32.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/1/0477/0218/0006/files/chevy_cruze_2020_engine_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/8824/6432/files/total_war_thrones_of_britannia_mercia_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9177/5654/files/primer_sight_word_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6692/4449/files/dudogejonewaduvivekelexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/4388/9562/files/style_guide_definition_deutsch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9446/8517/files/pidexalujuvado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/80268821746.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2720/8608/files/96046451373.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5425/1170/files/85263412723.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_off0000a8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8AB 5096 bytes
SHA-256: 1e3f62df7e5201f4e8cec37a419221bf5ca84514b715a197caa2802cd1dd57a3
font_01_sfnt_off0000b9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F4 10616 bytes
SHA-256: dd1f6a9ebfecb17cc3d081c37fcd03878001c00758d15a64fdd70f8757146c02

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