Malicious PDF — malware analysis report

Static analysis result for SHA-256 9796d2a6664aadc5…

MALICIOUS

PDF

43.4 KB Created: 2020-10-13 19:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ac3e30e3a266311a6d1773abbdc14999 SHA-1: 7c4a9de8c44e4c146bbb9f891ef63cb89ef605cd SHA-256: 9796d2a6664aadc5c9761863a56697aad53369bdb228e5d5bf04e1aded914555
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 for SEO manipulation. One prominent URL, 'https://gettraff.ru/strik?keyword=algebra+2+imaginary+numbers+worksheet+answers', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating its primary purpose is to redirect users to malicious infrastructure.

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=algebra+2+imaginary+numbers+worksheet+answers In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1515306.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/aa92d.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/1/0432/4828/7904/files/mike_and_nellies_steakhouse_in_new_jersey.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5052/7639/files/nuxasekeledawul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7730/0124/files/75961903006.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6465/1687/files/89761820493.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/3008/7333/files/anne_norton_the_signs_of_shopping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/929f464f-7aaf-4d9b-9e56-5fce819e8fdb/pexerolipikirifelanixuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a8a312-36d7-457a-a2d8-a1ffe7eae0b2/jemifutobejogetefus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e7069a-fd7e-4f5d-ab93-976b208dbf0f/jigojumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787cf930-0dae-40c6-bbbd-d17a99860c91/mamevemodamigisovoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b36ccea-74d1-47ce-86ae-2c2c4ec3be08/jusigasidegufawuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d18ba6b-59fe-405a-b56c-54489c8e4565/jabekunabafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b02f9890-3dc0-40e5-8411-a0dd0f9d5793/47823823741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23558bf4-e7d9-4db1-98f5-5cd3fe73cd31/66215958757.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_off000069f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F3 5620 bytes
SHA-256: 15e97ba9a1ba11bafe8023f4d063c1b01c69da2c7c6db1dc041dd8486c3db624
font_01_sfnt_off00007cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFD 10444 bytes
SHA-256: e8287a423a679a04b8fe2e7ffddc07d7e13ec4eeda94012076557a6c766353d3

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