Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c6a5ae48dfd13a…

MALICIOUS

PDF

58.8 KB Created: 2020-11-02 20:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b9fec705b9a7464b550f849557a01120 SHA-1: 2a0071ade85e729caca13a0bc56d359809a9f100 SHA-256: 52c6a5ae48dfd13acab8b4ae7b4bf73a9b30ad71e6b53a08834299efa8cc8f1e
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=queen+chess+on+same+color In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411483/normal_5f9c0eb101c60.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/7196078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/cours_sur_la_loi_binomiale.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/magazine_article_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/official_cuddle_buddy_application.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2587/3050/files/nagotifujiviponuju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7446/4160/files/44995822318.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/11213143937.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/cancionero_de_baladas_para_guitarra.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/32042422730.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/65126932429.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E4 5100 bytes
SHA-256: d3f9ad7a0134bf6cbce71ae0a88c4f4f28e1f4a3fc95a72080afae9a08daaee9
font_01_sfnt_off00009408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9408 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00009c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C96 12620 bytes
SHA-256: 3b7242b9eae417c869c24d6aef60bf602f8c44382ed66dc7f8cbe6c5bf96bd17
font_03_sfnt_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 17536 bytes
SHA-256: 1bad1cc8e1c20f56c79c4dc43f95a1023acdf28a36dffa9f05898095120949ff

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