Malicious PDF — malware analysis report

Static analysis result for SHA-256 785cde01f20b085b…

MALICIOUS

PDF

43.4 KB Created: 2020-09-20 00:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1c7644647937fd5dccb3df433947be4 SHA-1: 18a0b26db4b10216c4e7802c9b2f991f441d3145 SHA-256: 785cde01f20b085b309ca7db09b13f32b4a9ceae56cb64742e28fd3bab1eb0c5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector pointing to a URL related to 'gossip girl'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of this redirection infrastructure. Additionally, the 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external PDF links, many hosted on potentially compromised or controlled domains, suggesting an attempt to distribute malicious content or engage in SEO manipulation for traffic redirection. The ML classifier strongly supports the malicious verdict.

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://ttraff.link/wix?keyword=watch+gossip+girl+season+5+episode+5
    • http://dijeti.schihei.eu/uploads/1/3/1/3/131379605/b5e9cd491865.pdf
    • http://files.crcakids.com/uploads/1/3/0/9/130969981/galalakipu.pdf
    • http://kawiganu.foxpathfcr.com/uploads/1/3/0/7/130739173/b3490.pdf
    • https://cdn.shopify.com/s/files/1/0486/1090/2176/files/kg_to_ounce.pdf
    • https://cdn.shopify.com/s/files/1/0432/9409/7576/files/proper_care_and_feeding_of_husbands_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6908/7642/files/33658008083.pdf
    • https://cdn.shopify.com/s/files/1/0434/2035/2677/files/examen_espaol_quinto_bimestre_cuarto_grado_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0437/8161/9861/files/43442178230.pdf
    • https://cdn.shopify.com/s/files/1/0431/7537/9101/files/integrated_math_2_workbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/8000/6294/files/76883002104.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/wimejenajaguzido.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/don_t_look_back_in_anger_guitar.pdf
    • https://7290e645-6927-4cdb-98dc-669b0f07fe44.filesusr.com/ugd/eddc50_ebcedec1aaf34d938df9956ca3ef27af.pdf?index=true
    • https://85c1e96b-a84e-4a6a-b444-1de4eaa9cd4b.filesusr.com/ugd/097bd5_60506cb503ce47b7a679abf44b37ff0d.pdf?index=true
    • https://a42e0eb2-7495-4fbe-83eb-92a7d1ee6784.filesusr.com/ugd/3794ad_9b00c44203e040b4ba79a955a6ef367d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069b2.bin
3c52e426cb5b54651275ae49f3b2ad23fda37103b757ff059bfb73bb89d95b0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B2 5472 bytes
font_01_sfnt_off00007c56.bin
01246614f0f5dde4f17a9baa95aa5cfbe0721982e75b2e4c0ed022fd6655ed8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C56 10680 bytes

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