Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a19967aaf0e2898…

MALICIOUS

PDF

45.4 KB Created: 2020-10-24 05:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 892dea1a7d6ae4b6ea255283273cdf20 SHA-1: fee03b0516da8edfc07aa92ecbfb10eb45d8f39d SHA-256: 0a19967aaf0e289888cc8214f56f4b2634e55c532757a1c5d034961f7d400a38
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 external PDF files, suggesting a link farm or SEO spamming attempt. One of the primary links, https://cctraff.ru/strik?keyword=airline+codes+uk, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links.

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://cctraff.ru/strik?keyword=airline+codes+uk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f8daed87e181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f8b1cb136e8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f86fc85368cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_5f8ebc793b96d.pdfIn 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/a71c5601-16b4-406d-8400-a98c435160a9/mukazofexadofomegi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3826/8318/files/58786438814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/xexakapebifamisun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9789/2030/files/pwn_the_sat_math_guide_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2446/5051/files/lekoguse.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/canapes_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/19382244100.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/libegusufagaguvazowasa.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/kumpulan_paribasa_sunda.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/lizutipurarazipulolaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2400/6820/files/jenijokozovej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9682/5764/files/juki_mb-373_button_machine_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/factorization_of_quadratic_polynomials_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2246/5699/files/78249655335.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7274/9721/files/whatsapp_web_apk_terbaru_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adaea0be-fd8e-4261-87a0-0599df585059/18627411997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27120642-1240-4b9b-88a6-9450c1a924ce/tidinufilojaveg.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_off00007475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7475 4776 bytes
SHA-256: bf7ac33aa6afc01b48efbe5121a99d9e03a98bc0da31a1ccafb42f1fc854bd2b
font_01_sfnt_off000084c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C5 10324 bytes
SHA-256: ab41adb0aac14a27e9b5d4d42dd0743a3fc99301f9f4cb601541342fbb980a6f

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