Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b303146530353b…

MALICIOUS

PDF

39.4 KB Created: 2020-08-17 11:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d35bf3fed8cbf8fe83d072f1d0d84c2d SHA-1: 275da961019e703fe594d49ec4deff5fe8cc4b65 SHA-256: 98b303146530353bf290b26c719dc4e714eb2158fc3bfa078f5b982011f59f05
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicating a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a known malicious redirector, suggesting the primary purpose is to lure users to malicious sites.

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.cc/pify?keyword=child+in+time+live+video
    • http://jabuf.desertraw.com/uploads/1/3/0/7/130776257/doxapugumigu.pdf
    • http://nupasuxe.bootleggersevents.co.uk/uploads/1/3/0/8/130815017/papuwelum.pdf
    • http://files.match-gems.com/uploads/1/3/0/9/130969243/waruxe-gibotusupuwe-viputefetapaj-walugogigebomev.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/japerexofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1673/2315/files/xakenafububosokez.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0730/files/16997038103.pdf
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/dupuba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5578033559.pdf
    • https://cdn.shopify.com/s/files/1/0432/5225/2829/files/xogojunibemuzijizu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/wifojogewaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/dapenakewefixojajozegat.pdf
    • 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_off00005f4d.bin
12e2b56e4c0b4a4ddaf3dedab35865e4b82c69275aecbbff9d7a871417ba9c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4D 4548 bytes
font_01_sfnt_off00006e9c.bin
4d4a031cd7b60612c69a589423f7cae9294ee20787e4e1dd389a05f934a590dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9C 10172 bytes

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