Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c575a97fdebf4b1…

MALICIOUS

PDF

55.4 KB Created: 2020-10-24 16:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aaccd655ec185b7d95e7ee1a8a30a9b4 SHA-1: a2bf00dc1b59783230adb359dc96ca22af945ea6 SHA-256: 8c575a97fdebf4b1a4c58f9aaaa02a321528d0517034ec969482bcd66631aab1
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 0.9998

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://ttraff.com/123?keyword=fizz+build+guide+s8 In PDF document text
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/kamedod.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/6263843.pdfIn PDF document text
    • https://wanuwoziburake.weebly.com/uploads/1/3/4/4/134458428/tafojakekebamo_zebazaladided_banofevusuma_getobasol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5f8d727aa3231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f8cf9aac7cbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f882a970b009.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/vexeliku/xiwobirofujigimulorage.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/electronically_sign_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/bodirunamipoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/budget_2019_highlights_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/dixurozokekokamifotolam.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/bicarbonate_de_sodium_utilisation.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/83481466922.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/kosulobewugekeguxofipaw.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/el_bautismo_en_agua.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/encyclopedia_of_general_knowledge_by_ahmad_najib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6887/7721/files/gedivarawotupari.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1861/6473/files/keto_flux_phone_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/9128/0277/files/draw_the_orbital_diagram_for_argon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0054/4418/files/moles_and_mass_chemistry_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7888/4759/files/ps_vita_emulator_apk_pro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5774/8897/files/product_manager_resume_examples_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5172/0090/files/willie_lynch_syndrome_today.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5654/1077/files/58882823634.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5103/6055/files/nugujugizogesajago.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8400/8603/files/the_game_production_handbook_3rd_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74C1 5024 bytes
SHA-256: 07569f4ad0b2093e80e7d0514f6258d70b243ba270ccb8789bd7d2b3e2479d98
font_01_sfnt_off000085f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85F4 10584 bytes
SHA-256: c0dd72184a33f52594bc05e86ac0c8cc1eb478ecf603afdfe8b87104c0d5cd48
font_02_sfnt_off0000aa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA35 20960 bytes
SHA-256: bc381827a6379a91e4941f7966cc20f6dcb83a7196e48c34dfbd8ce10ef9c3d2