Malicious PDF — malware analysis report

Static analysis result for SHA-256 17267b32f4f4c825…

MALICIOUS

PDF

57.4 KB Created: 2020-10-02 19:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3ca4bdec4724efaa4119d3a1f257ed96 SHA-1: 756869a6e93da396481bf750f91a220125b84708 SHA-256: 17267b32f4f4c8254164833ad3b72a088b53b29b6236acb8dfaeb4a192408851
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 an SEO spam or link farm operation. One of the primary URLs, 'https://ggtraff.ru/strik?keyword=ejemplos+de+oraciones+con+antonimos+excluyentes', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and a title related to antonyms, indicating a deceptive lure.

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=ejemplos+de+oraciones+con+antonimos+excluyentes In PDF document text
    • http://files.wearecvsta.org/uploads/1/3/1/1/131163898/mupenelu.pdfIn PDF document text
    • http://dekitu.janedeutsch.com/uploads/1/3/0/8/130813604/e801f343f4e.pdfIn PDF document text
    • http://files.handyme1.com/uploads/1/3/1/3/131382430/0a6892758f.pdfIn PDF document text
    • http://files.softandsound.org/uploads/1/3/1/6/131637077/314a4511e38312.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/1/0431/9599/0175/files/pipojugezabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7135/4533/files/ap_human_geography_massively_gigantic_review_packet_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6808/7701/files/58292784536.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3913/7697/files/secret_panel_comic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7190/1347/files/mens_beach_hat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7148db-7071-4aad-a9dc-1bd61138a507/20732124514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9a4350b-985f-45d6-89e6-0de591a33666/28105908013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c8913d-4a6e-47ee-9bc3-b26ee125f0ea/livakeworukedofadexip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07db9ddc-d657-4641-8a4a-a85aaa04a253/96817667621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481f6ef4-2b2a-4ce6-9635-f0b0e74c9cba/85966980559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da4eff2-40a9-4021-acc6-db900d2362ca/73638567998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e09f15-1302-48db-8658-28e3b31aaa80/18843832892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3f60f6-0b0e-4f51-a56b-299b09291a68/fosozokapafulexonamokaxik.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_off00009f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F75 5420 bytes
SHA-256: 831d6404e92b4ef12635e5305145623c5ee201ac2e64cde9f738a8e5db898d95
font_01_sfnt_off0000b1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D7 11316 bytes
SHA-256: fc0b3eeaf3a18151aaaa5b8e505c14b00801b7d48d19084811f8ea97e10a3ab1

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