Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d3770a9a13d288…

MALICIOUS

PDF

45.7 KB Created: 2020-10-27 21:52:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b42076dcf4705da9b102772bb1e8fad0 SHA-1: d9ce1dffdd0ed8e1c2370a8151738f0715b370b6 SHA-256: 81d3770a9a13d288824f24e22de4cd7c7b41f5afae157a11e3898a0cb01db928
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=lazy+boy+small+recliners+on+sale In PDF document text
    • https://debaduvevuw.weebly.com/uploads/1/3/4/3/134383420/caa487ae4.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/9086294.pdfIn PDF document text
    • https://kixatefibav.weebly.com/uploads/1/3/0/7/130776592/wepis_muzok_zigow_wopefotub.pdfIn PDF document text
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/xabejodaka.pdfIn PDF document text
    • https://legadiduzavof.weebly.com/uploads/1/3/2/6/132681829/fusinun.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/8788062.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/6978290.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/4690111.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/1/0500/1058/7296/files/talking_tom_hero_dash_mod_apk_techylist.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/2257507303.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6112/4008/files/98899333330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9209/0788/files/bass_pro_employee_handbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/5613/3831/files/nebur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1746/9086/files/90837365737.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/2020_toyota_tacoma_manual_transmission_fluid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0200/3108/files/mepopuwulufufutevupofig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6681/7702/files/motupopibow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3555/5517/files/hp_deskjet_2600_manual_svenska.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3497/9751/files/jepefalukanibirigilepil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/assembler_jpeg_en_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6567/1325/files/naic_accounting_practices_and_procedures_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a05c42-e5a3-46dc-8791-21634bd176bd/vegafesokopixubogodovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58b0b45-7a13-4c31-a914-880f1693422e/55442521563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1512868e-ec7c-4af0-a34a-eff0ecf3c43a/gulegavegokezafaridevoma.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_off000070e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70E8 5176 bytes
SHA-256: 024f43af293ea4e02d2c58a9b76b00dee9af832a6f42857a73877b65d11c747c
font_01_sfnt_off0000827d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x827D 11628 bytes
SHA-256: 2a89549760bbabe3899eec5b922aea5139c43efa7616b45a0412781d67e54440

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