Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca1b11eca46a6ad…

MALICIOUS

PDF

35.2 KB Created: 2020-03-09 11:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 12539023674f3c60efa4b288e20e1ccf SHA-1: f33749a7e9b16e22c6b4c0783d155dfe8e50a96e SHA-256: 2ca1b11eca46a6ad8022595e23be44447c4cb5c70e091b7acb0b3c6b3a09bce2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF files hosted on various domains. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO poisoning scheme, potentially designed to distribute further malicious content or manipulate search engine results. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://heath-family.rominastiebenphotography.com/uploads/1/3/0/5/130588625/130588625.html#cumulative+distribution+function+in+%40risk
    • http://mail.moysmovies.com/uploads/1/3/0/4/130475984/8c6161bf.pdf
    • http://retojuanalainez.com/uploads/1/3/0/4/130436337/vosakanexux.pdf
    • http://seniorlivingday.com/uploads/1/3/0/5/130550743/5634966.pdf
    • http://sylvainetlesfilles.com/uploads/1/3/0/4/130435536/ruvoxusex_rewikob_wudune_fufadonevip.pdf
    • http://quicktan423.com/uploads/1/3/0/2/130287482/besavagib.pdf
    • http://msexcelplus.com/uploads/1/3/0/6/130639227/sigeni-mekos.pdf
    • http://www.taipeimanager.com/uploads/1/3/1/0/131070826/7624512.pdf
    • http://www.vitalpropertysolutions.com/uploads/1/3/0/2/130270906/5019542.pdf
    • http://hostmaster.coastlifedigital.com.au/uploads/1/3/0/5/130589295/790d08.pdf
    • http://newtcabin.com/uploads/1/3/0/5/130590368/2087d26.pdf
    • http://www.ryanhopehouse.com/uploads/1/3/0/7/130738841/dc112d.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_off00004d64.bin
c5fcce64e0b5481ad25fe4c77056ab716c58de2753df252f1f021016ee840801		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D64 7444 bytes
font_01_sfnt_off00006a72.bin
4bc316074ab7a945bfab345755761abf3c0c30bbefcbffa3ce2a779be7417175		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A72 16144 bytes

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