Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87743bd11a80118…

MALICIOUS

PDF

57.3 KB Created: 2020-10-26 20:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 259799004acdb2c9c970f289b4159c05 SHA-1: 2dbeabf24f666d68ed05b6b75216f2211a7494ba SHA-256: b87743bd11a80118d1f8ed44455d804c7e1ecda1c43d8ba8597f36cb684ec3d3
154 Risk Score

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://gettraff.ru/strik?keyword=c+2h2+ch4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f86fee906a02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_5f8d9f658e342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f86faf173f8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413242/normal_5f96cb6f6fea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_5f8f2b8e0facc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5f92285c778c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5f8c4444e3648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f88dc523e16b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5f9292301cfc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f8746d55a96d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f92732ed9602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5f88fe78f3450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5f8d7d36b83af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412780/normal_5f96d9844fa97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5f96ccfa8ae3e.pdfIn PDF document text
    • https://://sports.yahoo.com/nfl-ryquell-armstead-jaguars-covid-hospitalizations-222212695.html,thumbnail:{altTextIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/531c133e-dd3a-4a21-94f0-8735ce1fb397/movijaxusuzituvakifuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/526c6d2f-ba2c-4372-801c-57081e645fe8/81115515333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1401eeda-fd68-4543-b4cd-a7ec00a096f1/med_ash_blonde_hair_color.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d52ce40-73db-42f3-b2a2-7a126fb3f7aa/65916842679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71fbdc3-0ab2-4cfe-947f-e7a57dd72190/17133778095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/yasmin_mogahed_reclaim_your_heart_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5940/7765/files/didnt_find_class_androidx.core.app.corecomponentfactory_proguard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2962/7548/files/xorelutefegijesevu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5103/1447/files/unstable_angina_guidelines_aha.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8537/0022/files/67208190051.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a9a6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA9A6 26232 bytes
SHA-256: 4e3ba3e7ab27b054075b4710c8bc83fd9f78160547a502cc3c1478bc56d6dca5
font_00_sfnt_off000073cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73CF 4496 bytes
SHA-256: 345a1be1fcc8ff7a09def568274ee1b93826b883c22c98cc13f02bd7aa5583e9
font_01_sfnt_off00008318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8318 11352 bytes
SHA-256: 92d93d2a834434f3e227701f78454b8a417daef8cddf0715c4b630add5065a84