Malicious PDF — malware analysis report

Static analysis result for SHA-256 847dbb02769d2555…

MALICIOUS

PDF

56.9 KB Created: 2020-10-17 11:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 178344ddce9ddbb6d6e4226f2ad955e2 SHA-1: 654a173caa38506a6bf770caaf653c708970e62b SHA-256: 847dbb02769d2555d91d1626c1709546c77d6b559529b7efec8e13c12fa4cdd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a mass external PDF link farm. The primary malicious URL identified is 'https://gettraff.ru/strik?keyword=frequency+in+spanish'. The document body appears to be heavily obfuscated or corrupted, but the presence of numerous external links suggests an attempt to lure users to malicious infrastructure, likely for phishing or malware delivery.

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=frequency+in+spanish In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f8a866a9c144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f88036509ba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f8858cb2948d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5f8a1f4469a9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f873d7ade1c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f88c86606d50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5f882d3f21ed1.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/1/0434/0314/9479/files/apc_smart_ups_750_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6753/9605/files/62079975327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7481/8726/files/android_wear_apk_old_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1291/4332/files/secret_treaty_of_verona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4529/8077/files/input_and_output_of_photosynthesis_light_reaction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6001/4487/files/ap_us_history_chapter_1_new_world_beginnings_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1048/0533/files/final_exam_schedule_berkeley_spring_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/81614684456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1ef5587-1e78-4e28-a063-3d62c5cb7698/teepee_patterns_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106edbc8-dcbb-43a6-8a66-a6f4d5af5872/gubazakixivexurevujap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b437fe-f698-4716-a361-88f0ac223c40/mibikumawawewubunebeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614a5270-bc7a-4cb8-a143-568e27a2f855/soterolokenigowimaweruz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16e0397f-c96e-4f32-8e59-9b8da94f5d9a/24181040883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0697db89-8e41-4eaa-a532-568311d9cd7f/vinajobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d38a52-0e34-4b37-bb7a-a9488a090b1a/86023872709.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_off00009f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F71 5172 bytes
SHA-256: ea6f956c50f5baf3d67ae9442801ae601318007b04934f50b211d701f8ed5227
font_01_sfnt_off0000b110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB110 10856 bytes
SHA-256: d705efadbeca5871380043c8868fc86943ba5c86c271ffd67d62f003d6782ab6

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