Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf174d28038f7e5…

MALICIOUS

PDF

27.8 KB Created: 2020-06-01 19:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8cde3bfee824f648a7b63531921df33 SHA-1: 0940222c498361e5a13a08f7ae1e96a2d4ed9a04 SHA-256: dcf174d28038f7e593562038185403c4220641cdd098f4ffdbe62f9540d49595
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, includes references to 'Charlie brown christmas book pdf' and several URLs, reinforcing the link farm tactic. The ML_NYX_PDF_MALICIOUS heuristic strongly indicates malicious intent. The primary goal appears to be directing users to a network of hosted PDF files, likely for SEO manipulation or to serve as a distribution point for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://divinofelino.com/uploads/1/3/0/5/130551303/130551303.html#charlie+brown+christmas+book+pdf
    • http://instaproducts.business/uploads/1/3/0/6/130604877/e2c5a989db01a3.pdf
    • http://shop.redmosaicjewelry.com/uploads/1/3/0/5/130551262/082cc19f89.pdf
    • http://integratedcommunity.info/uploads/1/3/0/6/130621210/e625ea6121f4.pdf
    • http://mail.helenmcneil.com/uploads/1/3/0/6/130604631/sorowegiwaferan-femax-kutavafojes-dimibebaru.pdf
    • http://drinkshe.com/uploads/1/3/0/5/130550914/5243289.pdf
    • http://divinofelino.com/uploads/1/3/0/5/130551303/terms.html
    • http://divinofelino.com/uploads/1/3/0/5/130551303/dmca.html
    • http://divinofelino.com/uploads/1/3/0/5/130551303/policy.html
    • https://daxetojip161513793.files.wordpress.com/2020/05/jelimexomen.pdf
    • https://dujiratabug.files.wordpress.com/2020/05/lezedud.pdf
    • https://guvemajik.files.wordpress.com/2020/05/rojalezoxizokosabijuke.pdf
    • https://muwafinatub.files.wordpress.com/2020/05/89909492628.pdf
    • https://pepavujewow.files.wordpress.com/2020/05/86096773789.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004566.bin
00d28f511deb0c1a6eb9666cd480e8cd1e9fe06989fb4375d4751892144e6554		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4566 9040 bytes

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