Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e43f388e45d7354…

MALICIOUS

PDF

44.9 KB Created: 2020-10-25 14:30:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3e8ac738016840a6ef0da88cae9cd729 SHA-1: e3f68d757a8d44d66edea9db70425a7f1933bb47 SHA-256: 5e43f388e45d73541b9cb6d62d4aeb34721532c0388bd643971cdcd28cb28a7b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. The primary malicious URL identified is https://gettraff.ru/wb?keyword=pemdas%20worksheets%20for%208th%20grade.

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/wb?keyword=pemdas%20worksheets%20for%208th%20grade In 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/2f1108af-f177-4ff4-ae0a-82b6cf241bd9/51007888983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71061ddc-ddd1-4133-a95b-bd524ba3f76b/kodif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3b4ff1f-c597-40ff-97ac-f9279cd01b1b/mobile_home_parts_in_ky.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef7c3475-94dd-42ed-a6e6-6a939c4c7cfa/motugepixes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b1eae8-01c9-40b2-a2a0-1c98f07a77c3/kovabakejeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8841/7446/files/38183195889.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1854/2504/files/everfi_module_3_answers_budgeting.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/drc_congo_flags.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3132/6631/files/tipuwifanipiro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3778/6780/files/zubaxoxudanizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/8074/0771/files/salozikawozixaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/503ca783-215a-44a0-9e9c-82ae8c857726/35441398271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e998cbd-8ec4-418b-984e-49e39fb73686/lijuwegep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b042999c-655c-4516-8510-a0728338fd15/vimesatas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08dfa5f-1bb1-46c6-9f30-062d43305a0f/harman_kardon_hkts_16bq_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8328/4132/files/20890876710.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3163/3309/files/rebufixakepomesarun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/background_hd_wallpaper_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6507/1520/files/estructura_de_un_texto_expositivo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8685/5844/files/68w_combat_medic_pocket_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/1573/0886/files/guide_touristique_pyrenees_orientales.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6627/7534/files/4th_grade_multiplying_and_dividing_decimals_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0488/6166/files/85445954951.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4078/3008/files/vipajapekutejexizomori.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_off00006f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8A 5640 bytes
SHA-256: e9ba2ab0033de2d19f0eeeb232954ea0690ea01b237a826a4a8e2250c85680ee
font_01_sfnt_off000082aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82AA 10300 bytes
SHA-256: 5fb2e30f93b8f5165447f5f6fb77ac3c28e7765f44da9938fdb2c589bc1dce4e