Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cbb79bae37bdf3…

MALICIOUS

PDF

49.0 KB Created: 2020-11-02 18:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: bd2288e3a135c04478770e3fa31202b6 SHA-1: d29f6e43f08a47ecec67dc17136b577d3228520e SHA-256: 53cbb79bae37bdf38a301c5a9fe9722c7f1a3d5721e0492279581732c5d44f28
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://cctraff.ru/strik?keyword=transcription+style+guide In PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/muvedipufetubisofelo.pdfIn PDF document text
    • https://juleladenoduko.weebly.com/uploads/1/3/4/4/134478401/nuvuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f8d7d89ad71a.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/zigawufusewe-jubizagexeka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_5f962787aa303.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/1/0488/9424/7110/files/54462262502.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/nugozijumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da99e00f-de41-4281-933c-4e61f47cdc9b/i_spy_game_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/descargar_ultraviewer_para_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5746/1440/files/orsat_gas_analyser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/739317ad-29f2-4b88-bd24-469096f86216/dupikoxefajoxeror.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3935/7604/files/navemidifigojowikijop.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1D 5292 bytes
SHA-256: 6b946ab6696e554f59831ed37010ccc6a00f3863e383f22166dfb2dd5fdfc559
font_01_sfnt_off00007f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F30 10228 bytes
SHA-256: 8c47de2b154761d243eae1f132f104b933de09e961cc2c4b9a1568dd5b1ef821
font_02_sfnt_off0000a285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA285 16068 bytes
SHA-256: 9e1271d681207e96fe60c94df920a27091a957dc81e2614e9e6235263a34fce6

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