Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef4bcc52b6107b1…

MALICIOUS

PDF

49.9 KB Created: 2020-10-26 13:02:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 72e7c89295d559d7935ef60e885b4479 SHA-1: dca9ee7aec0faf012d553653cd9b15925b25ada7 SHA-256: 2ef4bcc52b6107b19a7f0521ddf5652f31ed093cb58de62249a5c9a9603766a0
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically directing users to 'https://gettraff.ru/strik?keyword=daredevil+born+again+read+online'. The document body also contains this URL and numerous other links, suggesting a link farm or SEO spamming attempt. The ML classifier also strongly indicated maliciousness.

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=daredevil+born+again+read+online In PDF document text
    • https://lewejasolon.weebly.com/uploads/1/3/1/4/131437246/wejiw-xubovotumaset-zejoz.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/51d2cf5e78041a5.pdfIn PDF document text
    • https://narogigadi.weebly.com/uploads/1/3/0/8/130874066/575e5c542c.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/kopiwu_gotatumeturi_bovejixegas_vivikow.pdfIn PDF document text
    • https://kodowogokilikid.weebly.com/uploads/1/3/4/4/134466607/7cce4a08ef770.pdfIn PDF document text
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/9328372.pdfIn PDF document text
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/a70e82884e9b7d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/47f7f2b2-7918-4eea-b020-299b7af9b4a5/64809939497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b45368d-966c-46b3-85b5-0d7096bc7e7f/jizevazidadapuresukoruno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f608bd-606f-4f0f-8a91-476a6aed3b80/zerixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/770066ad-b727-4ef8-8244-ee7511e3123c/95724577057.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0219/1269/files/77383972960.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4597/6221/files/the_puzzle_page_chemistry_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4155/3082/files/66717579878.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7750/9020/files/84619602836.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5289/8739/files/67646247345.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3556/9571/files/febububikoxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6676/4695/files/28808891787.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000777b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x777B 4724 bytes
SHA-256: d0b6044bd0fc8695a729b73c809264265c2f6434be873de73ff86f2439a19fc4
font_01_sfnt_off0000878b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x878B 10732 bytes
SHA-256: 732d3efa64aa670dbc6327f76595476b771a294b5c06f47cfce248375f31200b
font_02_sfnt_off0000abe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABE6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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