Malicious PDF — malware analysis report

Static analysis result for SHA-256 de35c544a36da6f9…

MALICIOUS

PDF

50.7 KB Created: 2020-10-30 22:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a30bfa13a068d71979ad5c50f8e6e63e SHA-1: dcda32aa8799ff0e7f9dbe4b2bb41c5911e40cc0 SHA-256: de35c544a36da6f9ffa85dde3e3fa0f3adc563a68f05ea04bb9778356ddb4de9
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/strik?keyword=dominant+vampire+draco+submissive+harry+fanfiction In PDF document text
    • https://mapuxotegudu.weebly.com/uploads/1/3/4/3/134356271/1972668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_5f8fed8cc48b3.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/1/0266/8534/1892/files/bademuzunadiwikozuzeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4581/3924/files/57416473004.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/8313/4626/files/lojeteralisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd8017f-4688-4629-a336-f8b175d107f2/ensayos_de_arquitectura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26d88c63-3153-43c5-b5bb-6ceee0745368/roxuteg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/genetics_practical_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69fddd8-fb28-4eca-971f-cf862a59d40d/wofasozi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/0852/1902/files/playbox_apk_for_ios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7800/4135/files/berisudanikobiji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8041/9990/files/72505099876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9329cdfe-2650-46ac-8cea-9e89a84436e7/the_egyptian_mika_waltari_audiobook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1290/5370/files/zizekivunonakirijoxupuved.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_off00007cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC1 5664 bytes
SHA-256: eddaba56903407ad90f4e1fd809ba5cd029584259644806c3b96093c2f003422
font_01_sfnt_off00008fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE5 14896 bytes
SHA-256: 1fcf497faf7c776c1b335ba9739af8aa44b21e009fd59241b1698b2b989f4cde

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