Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc62070728c250df…

MALICIOUS

PDF

44.9 KB Created: 2020-10-06 18:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2ada9efc6249023b0558958936263d0a SHA-1: 689c981ec6b6b47a91bfb5e062d276910049625c SHA-256: dc62070728c250df70b26933075e82ea6681b0bb2821f5bc0ee32ee86efa61bd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, with a critical heuristic identifying it as a link farm designed to redirect users to malicious infrastructure. The document body, though partially corrupted, includes text related to 'png image to pdf converter online' and the malicious URL, suggesting a lure for phishing or malware delivery. The ML classifier strongly indicates 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://cctraff.ru/strik?keyword=png+image+to+pdf+converter+online In PDF document text
    • http://sesulu.clasropes.com/uploads/1/3/2/6/132681670/tupejama_fabojaxep_welurabo_lunezalef.pdfIn PDF document text
    • http://sogod.pnjoinery.com/uploads/1/3/2/6/132682663/6121208.pdfIn PDF document text
    • http://files.littleluckydaisy.com/uploads/1/3/1/1/131164120/tavuxibe.pdfIn PDF document text
    • http://files.houseoffinland.org/uploads/1/3/1/1/131163854/e6d1e.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/98081389-5d19-4afb-9edf-c4d9af24b09c/33583190325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c75b6d7-ab5b-4dfc-b948-9cd1d034e1e5/wasujefekejuwijakigige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e1b527-1c39-49c5-9602-9d15eb13a90c/27412050109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3219/4453/files/72926056441.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4007/1070/files/vetabijifedumur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3444/1890/files/round_rock_high_school_mens_soccer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a49e222-3fc7-4547-9efa-f9f8fe21cbcb/80372281398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af433435-4fe4-43c5-a1f0-f42e4ac807cf/jegawarolozasogigesusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65655a85-03e3-4cb1-8fb7-f169eeb2a764/megumeranen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc4f621-0feb-48b8-8f92-94e39c71a961/futejusulosanugosajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80439f86-afc8-4798-ac2b-7df84e786a24/wumusitoritevus.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_off00006443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6443 5148 bytes
SHA-256: e976cdfca00580fafc09b97fda71e5d87133b8a67d78d18a1f49b7ecd5b1c7af
font_01_sfnt_off000075ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75AB 10096 bytes
SHA-256: ca339a9663b0d6131f425714f089269970ad48e7e48ced2863a0102099a55620
font_02_sfnt_off00009832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9832 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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