Malicious PDF — malware analysis report

Static analysis result for SHA-256 487a651adc4c9a52…

MALICIOUS

PDF

37.7 KB Created: 2020-10-05 05:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5d4774416af2a720e3d503d3f1849572 SHA-1: ff0991d5f5f8b2e39b01b51fcd210a77508b2c9b SHA-256: 487a651adc4c9a52678930d41f2ddd60f9a48713d7c0f0539b5b951f3f0a67b9
184 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL 'https://cctraff.ru/strik?keyword=staples+printable+tickets+template+1'. The document body, though heavily obfuscated, contains references to 'printable tickets template' and embedded URLs, suggesting a lure to trick users into clicking malicious links. The ML classifier strongly indicates maliciousness, and the presence of numerous links to disposable hosting further supports a malicious intent, likely to distribute further payloads or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=staples+printable+tickets+template+1 In PDF document text
    • https://site-1040224.mozfiles.com/files/1040224/27944628581.pdfIn PDF document text
    • https://site-1037061.mozfiles.com/files/1037061/38085725980.pdfIn PDF document text
    • https://site-1037189.mozfiles.com/files/1037189/33608737513.pdfIn PDF document text
    • https://site-1042768.mozfiles.com/files/1042768/sekefifubojejorepupodo.pdfIn PDF document text
    • http://gisevesa.bi-radialmatrixintro.com/uploads/1/3/0/7/130739353/682b55401d5.pdfIn PDF document text
    • http://pudugun.christhamilton.org/uploads/1/3/1/6/131606556/jadutidepumuku_sunuvow.pdfIn PDF document text
    • http://files.belizeentrecon.com/uploads/1/3/0/7/130776037/7350112.pdfIn PDF document text
    • http://tones.absolutezeronoho.com/uploads/1/3/1/4/131437668/vapamelebiniro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2ff61e3-4388-4d7e-ad64-dab4937cf007/75733807576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb688870-0424-439b-8108-9503e2cc6c10/modibaxaked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccbe1657-7b23-4c32-b74b-049599786041/71828916523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815b3ebf-4d08-4dde-982f-8676083d0575/77829969780.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1799/3877/files/nioh_armor_sets_bonuses.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6988/5601/files/what_is_in_spanish_fly.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0912/0152/files/verizon_kyocera_cadence_flip_phone_user_manual.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_off00005519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5519 5440 bytes
SHA-256: b247350e859b88a1bd2bcde08bbaed1097372d49362fb77121172458d81c7569
font_01_sfnt_off00006785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6785 10048 bytes
SHA-256: 397c6ab82afb0539dc6c24e9d2cd6b554bcbf0c38941495f7ef007f0bccb02e2

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