Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a65f23e6dd7367…

MALICIOUS

PDF

55.8 KB Created: 2020-09-30 23:40:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 30b2cdc6e0a0093538e8b45a33fbca4f SHA-1: 595d6c722522de378f18389e9d865417a6085bff SHA-256: c2a65f23e6dd7367762f0e4d1da7f7886cdeb55d5e9448248fa5889fadbfbcf1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to a link farm designed to obscure malicious redirectors. The primary malicious URL identified is https://ggtraff.ru/strik, which is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and appears to contain the malicious URLs.

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://ggtraff.ru/strik?keyword=the+acid-+alkaline+diet+for+optimum+health+pdf In PDF document text
    • http://fipowi.steinerseinsteins.com/uploads/1/3/0/9/130969723/6151255.pdfIn PDF document text
    • http://sekisu.maltacommunitychurch.com/uploads/1/3/1/3/131397997/jaxelof.pdfIn PDF document text
    • http://jujop.andrephotography.net/uploads/1/3/0/9/130969418/88229927519d56.pdfIn PDF document text
    • http://rizuk.fairhavenarts.org/uploads/1/3/1/8/131871479/8c77ec6f46ad2c.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/1/0431/3926/8765/files/51207279913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8592/9375/files/automobile_book_hindi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8555/3061/files/36233304433.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/aceite_de_coco_uso_cosmetico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/42119430401.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8918/9272/files/60030627326.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0184/5659/files/waresepegurilusozebu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab5aabc-8b4f-469c-9872-c99b7900f57b/89802311521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be48e1e4-0f95-430c-8787-19b12c8efeab/zaziga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a129b9-7cc2-4211-bc61-136f95a80d15/39639085117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efaded9f-a9bc-4518-97ef-8e02c53cae47/ginenofejagexitamixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0bf3449-d27f-4fc5-9729-c86a49e9d950/dovugibuvelobov.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_off00009bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC4 5260 bytes
SHA-256: 588a2d2a8b7ec07aad55578d9b35a9510e084502b082bd054cd24d4b9a4cacdc
font_01_sfnt_off0000ad85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD85 10652 bytes
SHA-256: 5f0873e7b56418dd88d98b40da8077c304c3fa9fbe35ced6a07a681cd13ed47e

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